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Fair Value Measurements (Assets and Liabilities Measured on a Recurring and Non-recurring Basis) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Assets:
Operating right-of-use assets	$ 32,515		$ 36,689
Liabilities:
Warrants Issued	3,074		7,725
ROU assets and leasehold improvements, carrying value	7,200
ROU assets and leasehold improvements, fair value	2,500
Impairment of right-of-use and long-lived assets	$ 4,671	$ 0
Level 1
Liabilities:
Money market funds, stable net asset value per share (in dollars per share)	$ 1.00
Recurring
Assets:
Total assets	$ 15,906		25,336
Liabilities:
Total liabilities	22,274		29,312
Recurring | No hedge designation | Interest rate reset
Liabilities:
Financing derivatives	16,900		18,800
Recurring | No hedge designation | Make-whole change of control
Liabilities:
Financing derivatives	1,600		1,600
Recurring | No hedge designation | Qualifying change of control
Liabilities:
Financing derivatives	700		1,187
Recurring | Series A
Liabilities:
Warrants Issued	3,074		7,508
Recurring | Series B-2
Liabilities:
Warrants Issued	0		217
Recurring | Money market funds
Assets:
Money market funds	15,906		24,327
Recurring | Certificates of deposits
Assets:
Money market funds	0		1,009
Recurring | Level 1
Assets:
Total assets	15,906		24,327
Liabilities:
Total liabilities	0		0
Recurring | Level 1 | No hedge designation | Interest rate reset
Liabilities:
Financing derivatives	0		0
Recurring | Level 1 | No hedge designation | Make-whole change of control
Liabilities:
Financing derivatives	0		0
Recurring | Level 1 | No hedge designation | Qualifying change of control
Liabilities:
Financing derivatives	0		0
Recurring | Level 1 | Series A
Liabilities:
Warrants Issued	0		0
Recurring | Level 1 | Series B-2
Liabilities:
Warrants Issued	0		0
Recurring | Level 1 | Money market funds
Assets:
Money market funds	15,906		24,327
Recurring | Level 1 | Certificates of deposits
Assets:
Money market funds	0		0
Recurring | Level 2
Assets:
Total assets	0		1,009
Liabilities:
Total liabilities	0		0
Recurring | Level 2 | No hedge designation | Interest rate reset
Liabilities:
Financing derivatives	0		0
Recurring | Level 2 | No hedge designation | Make-whole change of control
Liabilities:
Financing derivatives	0		0
Recurring | Level 2 | No hedge designation | Qualifying change of control
Liabilities:
Financing derivatives	0		0
Recurring | Level 2 | Series A
Liabilities:
Warrants Issued	0		0
Recurring | Level 2 | Series B-2
Liabilities:
Warrants Issued	0		0
Recurring | Level 2 | Money market funds
Assets:
Money market funds	0		0
Recurring | Level 2 | Certificates of deposits
Assets:
Money market funds	0		1,009
Recurring | Level 3
Assets:
Total assets	0		0
Liabilities:
Total liabilities	22,274		29,312
Recurring | Level 3 | No hedge designation | Interest rate reset
Liabilities:
Financing derivatives	16,900		18,800
Recurring | Level 3 | No hedge designation | Make-whole change of control
Liabilities:
Financing derivatives	1,600		1,600
Recurring | Level 3 | No hedge designation | Qualifying change of control
Liabilities:
Financing derivatives	700		1,187
Recurring | Level 3 | Series A
Liabilities:
Warrants Issued	3,074		7,508
Recurring | Level 3 | Series B-2
Liabilities:
Warrants Issued	0		217
Recurring | Level 3 | Money market funds
Assets:
Money market funds	0		0
Recurring | Level 3 | Certificates of deposits
Assets:
Money market funds	0		0
Nonrecurring
Assets:
Total assets	2,501		0
Operating right-of-use assets	2,033		0
Leasehold improvements and other	468		0
Nonrecurring | Level 1
Assets:
Total assets	0		0
Operating right-of-use assets	0		0
Leasehold improvements and other	0		0
Nonrecurring | Level 2
Assets:
Total assets	0		0
Operating right-of-use assets	0		0
Leasehold improvements and other	0		0
Nonrecurring | Level 3
Assets:
Total assets	2,501		0
Operating right-of-use assets	2,033		0
Leasehold improvements and other	$ 468		$ 0

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