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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net cash provided by (used in) operating activities | $ 35,007 | $ 69,429 | $ 199,158 | $ 158,138 | $ 85,835
Net cash provided by (used) in investing activities | (333,216) | (160,399) | (840,579) | (323,248) | (105,315)
Net cash provided by (used in) financing activities | 357,101 | 9,966 | 714,612 | 256,539 | 20,224
Net increase in cash and cash equivalents | 58,892 | (81,004) | 73,191 | 91,429 | 744
Cash and cash equivalents at beginning of period | 167,088 | 93,897 | 93,897 | 2,468 | 1,724
Cash and cash equivalents at end of period | 225,980 | 12,893 | 167,088 | 93,897 | 2,468
Parent [Member] |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net cash provided by (used in) operating activities | 35,682 | 69,101 | 195,734 | 154,329 | 81,651
Net cash provided by (used) in investing activities | (332,807) | (160,344) | (838,177) | (320,203) | (101,042)
Net cash provided by (used in) financing activities | 357,101 | 9,966 | 714,612 | 256,539 | 20,224
Net increase in cash and cash equivalents | 59,976 | (81,277) | 72,169 | 90,665 | 833
Cash and cash equivalents at beginning of period | 165,293 | 93,124 | 93,124 | 2,459 | 1,626
Cash and cash equivalents at end of period | 225,269 | 11,847 | 165,293 | 93,124 | 2,459
Guarantor [Member] |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net cash provided by (used in) operating activities | (675) | 328 | 3,425 | 3,808 | 4,184
Net cash provided by (used) in investing activities | (410) | (55) | (2,402) | (3,045) | (4,273)
Net cash provided by (used in) financing activities | 0 | 0 | 0 | 0 | 0
Net increase in cash and cash equivalents | (1,085) | 273 | 1,023 | 763 | (89)
Cash and cash equivalents at beginning of period | 1,795 | 772 | 772 | 9 | 98
Cash and cash equivalents at end of period | 710 | 1,045 | 1,795 | 772 | 9
Non-Guarantor [Member] |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net cash provided by (used in) operating activities | 0 | 0 | (1) | 1 | 0
Net cash provided by (used) in investing activities | (7,529) | (67,063) | (103,915) | (25,858) | (3,719)
Net cash provided by (used in) financing activities | 7,530 | 67,063 | 103,915 | 25,858 | 3,719
Net increase in cash and cash equivalents | 1 | 0 | (1) | 1 | 0
Cash and cash equivalents at beginning of period | 0 | 1 | 1 | 0 | 0
Cash and cash equivalents at end of period | 1 | 1 | 0 | 1 | 0
Eliminations [Member] |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net cash provided by (used in) operating activities | 0 | 0 | 0 | 0 | 0
Net cash provided by (used) in investing activities | 7,530 | 67,063 | 103,915 | 25,858 | 3,719
Net cash provided by (used in) financing activities | (7,530) | (67,063) | (103,915) | (25,858) | (3,719)
Net increase in cash and cash equivalents | 0 | 0 | 0 | 0 | 0
Cash and cash equivalents at beginning of period | 0 | 0 | 0 | 0 | 0
Cash and cash equivalents at end of period | $ 0 | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 + Details
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