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Long-Term Obligations and Commitments, Long-Term Obligations (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Long-Term Obligations [Abstract] |  |  |  |  |
Total long-term obligations, including current portion | $ 787,526 |  |  | $ 646,720 |
Less: current portion | (2,026) |  |  | (13,749) |
Total Long-Term Obligations | 785,500 |  |  | 632,971 |
0.125 Percent Convertible Senior Notes [Member] |  |  |  |  |
Long-Term Obligations [Abstract] |  |  |  |  |
Total long-term obligations, including current portion | $ 434,711 |  |  | $ 0 |
Interest rate on convertible senior notes | 0.125% |  |  | 0.125% |
1 Percent Convertible Senior Notes [Member] |  |  |  |  |
Long-Term Obligations [Abstract] |  |  |  |  |
Total long-term obligations, including current portion | $ 275,333 |  |  | $ 568,215 |
Interest rate on convertible senior notes | 1.00% | 1.00% | 1.00% | 1.00% |
Long-term Mortgage Debt [Member] |  |  |  |  |
Long-Term Obligations [Abstract] |  |  |  |  |
Total long-term obligations, including current portion | $ 59,913 |  |  | $ 59,842 |
Fixed Rate Note with Morgan Stanley [Member] |  |  |  |  |
Long-Term Obligations [Abstract] |  |  |  |  |
Total long-term obligations, including current portion | 0 |  |  | 12,500 | [1]
Less: current portion |  |  |  | (12,500) |
Leases and Other Obligations [Member] |  |  |  |  |
Long-Term Obligations [Abstract] |  |  |  |  |
Total long-term obligations, including current portion | $ 17,569 |  |  | $ 6,163 |
[1] | Our $12.5 million fixed rate note with Morgan Stanley was included in our current portion of long-term obligations on our consolidated balance sheet at December 31, 2018. We paid off our fixed rate note in the third quarter of 2019.

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- Definition Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of long-term debt, capital lease and other obligations (with maturities initially due after one year or beyond the operating cycle if longer). + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Amount of long-term debt and lease obligation, classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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