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, 2014
Sep. 30, 2013
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 285,899 $ 141,030
Net cash provided by (used in) investing activities (904,047) (570,828)
Net cash provided by (used in) financing activities 312,075 358,176
Net decrease in cash and cash equivalents (306,073) (71,622)
Cash and cash equivalents at beginning of period 458,956 167,088
Cash and cash equivalents at end of period 152,883 95,466
Parent Company [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 286,500 139,818
Net cash provided by (used in) investing activities (897,527) (569,291)
Net cash provided by (used in) financing activities 312,075 358,176
Net decrease in cash and cash equivalents (298,952) (71,297)
Cash and cash equivalents at beginning of period 451,431 165,293
Cash and cash equivalents at end of period 152,479 93,996
Guarantor [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (598) 1,213
Net cash provided by (used in) investing activities (6,523) (1,539)
Net cash provided by (used in) financing activities 0 0
Net decrease in cash and cash equivalents (7,121) (326)
Cash and cash equivalents at beginning of period 7,525 1,795
Cash and cash equivalents at end of period 404 1,469
Non-Guarantor [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (3) (1)
Net cash provided by (used in) investing activities (16,569) (25,087)
Net cash provided by (used in) financing activities 16,572 25,089
Net decrease in cash and cash equivalents 0 1
Cash and cash equivalents at beginning of period 0 0
Cash and cash equivalents at end of period 0 1
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 16,572 25,089
Net cash provided by (used in) financing activities (16,572) (25,089)
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