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Debt Senior Notes (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 19, 2013 | Jun. 30, 2013
Debt Instrument [Line Items] |  |
Interest rate |  | 7.75%
Senior Notes Due 2013 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 7.75%
Senior Unsecured Notes Due April 2023 |  |
Debt Instrument [Line Items] |  |
Redemption Period After Closing of Offering |  | 0 years 0 months 90 days
Senior Unsecured Notes Due April 2023 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Face amount | $ 300,000 |
Debt Instrument, Maturity Date | Apr. 01, 2023 |
Interest rate | 5.125% | 5.125%
Debt Instrument, Redemption Price Calculation Contributor, Percentage | 100.00% |
Debt Instrument, Redemption Price, Percentage | 105.125% |
Redemption period beginning April 1, 2018 |  | 12 months
Registration Rights Agreement [Member] |  |
Debt Instrument [Line Items] |  |
File Period After Closing of Offering | 0 years 0 months 75 days |
Declare Period After Closing of Offering | 0 years 0 months 180 days |
Registration Rights Agreement [Member] | Senior Notes |  |
Debt Instrument [Line Items] |  |
Additional Interest | 0.25% |
Senior Notes Due 2021 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 6.625%
Maximum | Senior Unsecured Notes Due April 2023 |  |
Debt Instrument [Line Items] |  |
Notice Period Prior to Redemption |  | 0 years 0 months 60 days
Maximum | Senior Unsecured Notes Due April 2023 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Period, Percentage of Principal Amount Redeemable | 35.00% |
Maximum | Registration Rights Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Additional Interest | 1.00% |
Minimum | Senior Unsecured Notes Due April 2023 |  |
Debt Instrument [Line Items] |  |
Notice Period Prior to Redemption |  | 0 years 0 months 30 days
Minimum | Senior Unsecured Notes Due April 2023 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage of Principal Remaining After Redemption | 65.00% |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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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