Notes Payable, Long-Term Debt and Other Obligations (Non-Cash Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Disclosure [Abstract]
Amortization of debt discount, net	$ 847	$ 5,447	$ 5,447	$ 13,972
Amortization of debt issuance costs	889	1,053	2,047	2,238
Non-cash interest expense	$ 1,736	$ 6,500	$ 7,494	$ 16,210

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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-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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