Leases (Lease Assets and Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Finance lease cost:
Amortization of right-of-use assets	$ 544		$ 1,986
Interest on lease liabilities	87		317
Operating lease cost	205		821
Short-term lease cost	180		463
Variable lease cost	63		253
Sublease income	(799)	$ (1,199)	(3,195)	$ (3,595)
Total lease cost	280		645
Capitalized operating lease cost	3,409		10,115
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for finance leases	(87)		(317)
Operating cash flows for operating leases	(205)		(821)
Investing cash flows for operating leases	(3,510)		(7,498)
Financing cash flows for finance leases	(557)		(2,002)
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 256		$ 1,643
Weighted-average remaining lease term - finance leases	3 years 7 months		3 years 7 months
Weighted-average remaining lease term - operating leases	1 year		1 year
Weighted-average discount rate - finance leases	6.29%		6.29%
Weighted-average discount rate - operating leases	10.97%		10.97%