Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Narrative (Details)

v3.8.0.1
Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation [Abstract]      
Stock-based compensation expense $ 10,600 $ 12,300 $ 14,400
Capitalized stock-based compensation $ 4,246 $ 4,900 $ 5,743
Additional time over vesting period 1 year    
Options granted for compensation plan 0 0 0
Unrecognized compensation expense $ 14,400    
Weighted average period 1 year 5 months 16 days