Changes In Capitalization (Details) - USD ($) |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
May 31, 2018 |
Jan. 31, 2018 |
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| Class of Stock [Line Items] | ||||
| Stock repurchase program, authorized amount | $ 200,000,000 | $ 100,000,000 | ||
| Stock repurchase program, additional authorized amount | $ 100,000,000 | |||
| Stock repurchased and retired during period (in shares) | 100,000 | 20,700,000 | ||
| Stock repurchased and retired during period, net of tax | $ 200,000,000.0 | |||
| Stock repurchased and retired during period, value | $ 30,688,000 | $ 200,251,000 | ||
| Tax withholding requirement | $ 700,000 | |||
| Common Stock | ||||
| Class of Stock [Line Items] | ||||
| Stock repurchased and retired during period (in shares) | 3,951,198 | 20,746,536 | ||
| Stock repurchased and retired during period, value | $ 40,000 | $ 207,000 | ||
| Share Repurchase Program | Common Stock | ||||
| Class of Stock [Line Items] | ||||
| Stock repurchased and retired during period (in shares) | 3,800,000 | |||
| Stock repurchased and retired during period, value | $ 30,000,000.0 | |||
| X | ||||||||||
- Definition Stock Repurchase Program, Additional Authorized Amount No definition available.
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- Definition Stock Repurchased and Retired During Period, Value, Net Of Tax No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of stock repurchase plan authorized. No definition available.
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- Definition Number of shares that have been repurchased and retired during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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