Notes Payable, Long-Term Debt and Other Obligations (Non-Cash Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Disclosure [Abstract]
Amortization of debt discount, net	$ 89	$ 5,746	$ 5,536	$ 19,718
Amortization of debt issuance costs	847	1,089	2,894	3,327
Non-cash interest expense	$ 936	$ 6,835	$ 8,430	$ 23,045

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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