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Condensed Consolidating Financial Information - Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | $ 73,545 | $ 99,497
Net cash provided by (used in) investing activities | (384,529) | (254,266)
Net cash provided by (used in) financing activities | 358,281 | 67,485
Net increase (decrease) in cash and cash equivalents | 47,297 | (87,284)
Cash and cash equivalents at beginning of period | 167,088 | 93,897
Cash and cash equivalents at end of period | 214,385 | 6,613
Parent [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | 73,633 | 98,827
Net cash provided by (used in) investing activities | (383,817) | (253,175)
Net cash provided by (used in) financing activities | 358,281 | 67,485
Net increase (decrease) in cash and cash equivalents | 48,097 | (86,863)
Cash and cash equivalents at beginning of period | 165,293 | 93,124
Cash and cash equivalents at end of period | 213,390 | 6,261
Guarantor [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | (88) | 670
Net cash provided by (used in) investing activities | (712) | (1,091)
Net cash provided by (used in) financing activities | 0 | 0
Net increase (decrease) in cash and cash equivalents | (800) | (421)
Cash and cash equivalents at beginning of period | 1,795 | 772
Cash and cash equivalents at end of period | 995 | 351
Non-Guarantor [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 | (15,055) | (78,312)
Net cash provided by (used in) financing activities | 15,055 | 78,312
Net increase (decrease) in cash and cash equivalents | 0 | 0
Cash and cash equivalents at beginning of period | 0 | 1
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 | 15,055 | 78,312
Net cash provided by (used in) financing activities | (15,055) | (78,312)
Net increase (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

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