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Financing Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2014
Debt Disclosure [Abstract] |
Summary of carrying values and coupon rates on financing arrangements | The carrying values and the fixed contractual coupon rates of the Company's financing arrangements are as follows (dollars in thousands):
| December 31, 2014 |  |  | December 31, 2013 |
Convertible notes payable, 2.16% to 3.84%, due 2015, VIE | $ | 334 |  |  | $ | — |
Current portion notes payable, 8.64%, due August 1, 2014 | — |  |  | 6,642 |
Current portion notes payable, 8.90%, due August 1, 2014 | — |  |  | 2,467 |
Total current portion of notes payable | $ | 334 |  |  | $ | 9,109 |
2019 Convertible Senior Notes |  |  |
Principal amount outstanding | $ | 245,000 |  |  | $ | — |
Unamortized discount | (49,092 | ) |  | — |
Net carrying amount | 195,908 |  |  | — |
Total long-term portion of notes payable | $ | 195,908 |  |  | $ | — |
Schedule of principal payments on long-term debt obligations | rincipal payments on long-term debt obligations of $245.0 million in 2019.

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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