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Condensed Consolidating Financial Information - Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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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

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