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Long-Term Obligations and Commitments, Convertible Notes (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) | Nov. 30, 2014 USD ($) | Dec. 31, 2018 USD ($) shares $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2017
Convertible Notes [Abstract] |  |  |  |  |  |
Loss on early retirement of debt |  |  | $ 0 | $ 0 | $ (3,983) |
Amortization of debt discount and debt issuance costs |  |  | 35,200 | 32,500 | $ 25,100 |
Long-term debt |  |  | $ 568,215 | $ 533,111 |  |
1 Percent Convertible Senior Notes [Member] |  |  |  |  |  |
Convertible Notes [Abstract] |  |  |  |  |  |
Maturity date |  |  | Nov. 30, 2021 |  |  |
Interest rate | 1.00% |  | 1.00% | 1.00% | 1.00% | 1.00%
Conversion price per share (in dollars per share) | $ / shares |  |  | $ 66.81 |  |  |
Total shares of common stock subject to conversion (in shares) | shares |  |  | 10,300,000 |  |  |
Percentage of principal amount used a purchase price upon occurrence of fundamental change |  |  | 100.00% |  |  |
Principal amount of convertible notes outstanding |  |  | $ 685,450 | $ 685,450 |  |
Unamortized portion of debt discount |  |  | 110,817 | 144,112 |  |
Long-term debt |  |  | 568,215 | 533,111 |  |
Carrying value of equity component |  |  | 219,011 | 219,011 |  |
1 Percent Convertible Senior Notes [Member] | Level 2 [Member] |  |  |  |  |  |
Convertible Notes [Abstract] |  |  |  |  |  |
Fair value of outstanding notes |  |  | $ 724,966 | $ 727,420 |  |
1 Percent Convertible Senior Notes Issued in November 2014 [Member] |  |  |  |  |  |
Convertible Notes [Abstract] |  |  |  |  |  |
Face amount of offering |  | $ 500,000 |  |  |  |
Proceeds from issuance of 1 percent convertible senior notes, net of issuance costs |  | 487,000 |  |  |  |
Issue date |  |  | Nov. 30, 2014 |  |  |
Effective interest rate |  |  | 7.80% |  |  |
Amortization period of debt discount |  |  | 7 years |  |  |
1 Percent Convertible Senior Notes Issued in November 2014 [Member] | Borrowing Rate [Member] |  |  |  |  |  |
Convertible Notes [Abstract] |  |  |  |  |  |
Debt measurement input rate |  |  | 0.074 |  |  |
1 Percent Convertible Senior Notes Issued in December 2016 [Member] |  |  |  |  |  |
Convertible Notes [Abstract] |  |  |  |  |  |
Face amount of offering | $ 185,500 |  |  |  | $ 185,500 |
Issue date |  |  | Dec. 31, 2016 |  |  |
Effective interest rate |  |  | 7.20% |  |  |
Amortization period of debt discount |  |  | 5 years |  |  |
1 Percent Convertible Senior Notes Issued in December 2016 [Member] | Borrowing Rate [Member] |  |  |  |  |  |
Convertible Notes [Abstract] |  |  |  |  |  |
Debt measurement input rate |  |  | 0.068 |  |  |
2 3/4 Percent Convertible Senior Notes [Member] |  |  |  |  |  |
Convertible Notes [Abstract] |  |  |  |  |  |
Principal amount repurchased | 61,100 | 140,000 |  |  | $ 61,100 |
Repurchase of convertible senior notes |  | 441,900 |  |  |  |
Loss on early retirement of debt | $ 3,983 |  |  |  |  |
Interest rate | 2.75% |  | 2.75% | 2.75% | 2.75% | 2.75%
Principal amount of convertible notes outstanding |  | $ 61,200 |  |  |  |

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