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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
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

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Amount of long-term debt, capital lease and other obligations due after one year or beyond the normal operating cycle, if longer.

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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))
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- Definition

Amount of long-term debt and lease obligation, classified as current.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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