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Earnings Per Share - Narrative (Details) (USD $) In Thousands, except Share data, unless otherwise specified |  |  |  | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended |  |  |
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Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2013 | Jun. 30, 2014 Stock Options [Member] | Mar. 31, 2014 Common Stock | Jun. 30, 2014 Nonvested Stock Awards [Member] | Mar. 31, 2014 TEU Senior Amortizing Notes | Jun. 30, 2014 Tangible Equity Units | Mar. 31, 2014 Tangible Equity Units | Mar. 31, 2014 Debt Instrument, Convertible, Stock Price Trigger, Range One [Member] TEU Senior Amortizing Notes | Jun. 30, 2014 Debt Instrument, Convertible, Stock Price Trigger, Range One [Member] TEU Senior Amortizing Notes | Mar. 31, 2014 Debt Instrument, Convertible, Stock Price Trigger, Range Two [Member] TEU Senior Amortizing Notes | Jun. 30, 2014 Debt Instrument, Convertible, Stock Price Trigger, Range Two [Member] TEU Senior Amortizing Notes | Mar. 31, 2014 Debt Instrument, Convertible, Stock Price Trigger, Range Two [Member] Tangible Equity Units | Jun. 30, 2014 Senior Notes [Member] TEU Senior Amortizing Notes | Sep. 30, 2013 Senior Notes [Member] TEU Senior Amortizing Notes | Jul. 17, 2012 Senior Notes [Member] Tangible Equity Units
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities |  |  |  | 700,000 |  | 300,000 |  | 5,200,000 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Units |  |  |  |  | 1,368,108 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  |  |  | 1.5372 |  |  | 1.72414 | 1.72414 | 1.40746 | 1.40746 |  |  |  |
Common stock, par value (in US$ per share) | $ 0.001 | $ 0.001 | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tangible Equity Units (TEUs) Converted during period units |  |  |  |  |  |  |  |  | 890,000 | 115,433 |  |  |  | 1,252,675 |  |  |
Stated interest rate on debt instrument (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50%
Debt Instrument, Convertible, Stock Price Trigger |  |  |  |  |  |  |  |  |  |  | $ 14.50 | $ 17.75 | $ 17.75 |  |  |  |
Tangible Equity Units outstanding |  |  |  |  |  |  |  | 3,700,000 |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,317 | $ 16,141 |
Shares of common stock issuable upon conversion |  |  |  |  |  |  |  | 5,200,000 |  |  |  |  |  |  |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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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- Definition Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Conversion Rate -URI http://asc.fasb.org/extlink&oid=6509012 + Details
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