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Debt Senior Notes (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 6 Months Ended | 12 Months Ended | 24 Months Ended |  |  | 3 Months Ended |  |  |
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Jun. 30, 2014 | Jun. 30, 2013 | Nov. 14, 2016 | Nov. 14, 2015 | Nov. 15, 2018 | Dec. 31, 2013 | Jun. 30, 2014 2018 Senior Notes [Member] | Jun. 30, 2014 2017 Convertible Senior Notes [Member] | Jun. 30, 2014 2018 Convertible Senior Notes [Member] | Jun. 30, 2014 Face Value [Member] 2018 Senior Notes [Member] | May 08, 2012 Face Value [Member] 2018 Senior Notes [Member] | Nov. 12, 2010 Face Value [Member] 2018 Senior Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior subordinated notes due 2017 | $ 57,500,000 |  |  |  |  | $ 57,500,000 |  | $ 57,500,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 8.625% | 3.25% | 3.00% |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  | 102.20% | 104.30% | 100.00% |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  |  |  |  | 42.0159 | 30.9478 |  |  |
Debt Instrument Convertible Principal Amount Used In Conversion Rate Calculation |  |  |  |  |  |  |  | 1,000 | 1,000 |  |  |
Debt Instrument, Convertible, Conversion Price |  |  |  |  |  |  |  | $ 23.80 | $ 32.31 |  |  |
Stock Issued During Period, Shares, Other |  |  |  |  |  |  |  | 2.4 | 2.7 |  |  |
Senior notes | 228,269,000 |  |  |  |  | 228,070,000 |  |  |  | 230,000,000 | 30,000,000 | 200,000,000
Preferred Stock, Dividend Rate, Percentage | 9.75% |  |  |  |  |  |  |  |  |  |  |
Restricted Payments Basket | 141,200,000 |  |  |  |  |  |  |  |  |  |  |
Convertible senior subordinated notes due 2018 | 86,250,000 |  |  |  |  | 86,250,000 |  |  | 86,250,000 |  |  |
Redemption of preferred shares | 0 | 50,352,000 |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock | $ (2,438,000) |  |  |  |  |  |  |  |  |  |  |

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- Definition 2018 Convertible Subordinated Debt + References No definition available. + Details
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- Definition Restricted Payments Basket, as defined in the indenture governing the Company's 2018 Senior Notes + References No definition available. + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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