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Long-Term Debt - Convertible Senior Notes Dues 2032 (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2016 | Mar. 31, 2012 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Carrying amount |  |  | $ 698,195 |  | $ 698,195 |  |  |
Unamortized debt discount |  |  | 9,448 |  | 9,448 |  |  |
Gain on repurchase of long-term debt |  |  | 244 | $ 0 | 546 | $ 0 |  |
Convertible Senior Notes Maturing March 2032 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Carrying amount |  | $ 200,000 | 185,116 |  | 185,116 |  |  | $ 200,000
Interest rate (as a percent) |  | 3.25% |  |  |  |  |  |
Frequency of periodic payment |  | semi-annually |  |  |  |  |  |
Maturity date |  | Mar. 15, 2032 |  |  |  |  |  |
Initial conversion ratio |  | 0.0399752 |  |  |  |  |  |
Initial conversion price per share |  | $ 25.02 |  |  |  |  |  |
Redemption price as a percentage of principal amount |  | 100.00% |  |  |  |  |  |
Repurchase price as a percentage of principal amount |  | 100.00% |  |  |  |  |  |
Expected life used to estimate fair value |  | 6 years |  |  |  |  |  |
Effective interest rate (as a percent) |  | 6.90% |  |  |  |  |  |
Carrying amount of equity component |  | $ 22,500 |  |  |  |  |  |
Unamortized debt discount |  | $ 35,400 | 9,448 |  | 9,448 |  |  | $ 15,000
Repurchased principal amount | $ 7,600 |  |  |  |  |  | $ 7,300 |
Repurchase amount | 7,000 |  |  |  |  |  | $ 6,500 |
Accrued Interest included in repurchase amount | $ 100 |  |  |  |  |  |  |
Gain on repurchase of long-term debt |  |  | 200 |  | 500 |  |  |
Amortization of debt issuance costs and discounts |  |  | $ 500 |  | $ 1,000 |  |  |

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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + 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=66902209&loc=d3e3602-108585 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: 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 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)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 + Details
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- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031897-161870 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: 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)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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=64930785&loc=d3e28551-108399 + Details
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