Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidating Financial Information - Condensed Consolidating Statement of Cash Flows (Details)

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Condensed Consolidating Financial Information - Condensed Consolidating Statement of Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 141,030 $ 165,876
Net cash provided by (used in) investing activities (570,828) (387,893)
Net cash provided by (used in) financing activities 358,176 140,400
Net decrease in cash and cash equivalents (71,622) (81,617)
Cash and cash equivalents at beginning of period 167,088 93,897
Cash and cash equivalents at end of period 95,466 12,280
Parent [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 139,818 164,659
Net cash provided by (used in) investing activities (569,291) (386,506)
Net cash provided by (used in) financing activities 358,176 140,400
Net decrease in cash and cash equivalents (71,297) (81,447)
Cash and cash equivalents at beginning of period 165,293 93,124
Cash and cash equivalents at end of period 93,996 11,677
Guarantor [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 1,213 1,218
Net cash provided by (used in) investing activities (1,539) (1,387)
Net cash provided by (used in) financing activities 0 0
Net decrease in cash and cash equivalents (326) (169)
Cash and cash equivalents at beginning of period 1,795 772
Cash and cash equivalents at end of period 1,469 603
Non-Guarantor [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (1) (1)
Net cash provided by (used in) investing activities (25,087) (93,436)
Net cash provided by (used in) financing activities 25,089 93,436
Net decrease in cash and cash equivalents 1 (1)
Cash and cash equivalents at beginning of period 0 1
Cash and cash equivalents at end of period 1 0
Eliminations [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 0 0
Net cash provided by (used in) investing activities 25,089 93,436
Net cash provided by (used in) financing activities (25,089) (93,436)
Net decrease in cash and cash equivalents 0 0
Cash and cash equivalents at beginning of period 0 0
Cash and cash equivalents at end of period $ 0 $ 0