Leases (Lease Cost) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Finance lease cost:
Amortization of right-of-use assets	$ 749		$ 1,442
Interest on lease liabilities	117		230
Operating lease cost	308		616
Short-term lease cost	154		283
Variable lease cost	95		190
Sublease income	(1,198)	$ (1,198)	(2,396)	$ (2,396)
Total lease cost	225		365
Capitalized operating lease cost	3,371		6,706
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for finance leases	(117)		(230)
Operating cash flows for operating leases	(308)		(616)
Investing cash flows for operating leases	(2,965)		(3,988)
Financing cash flows for finance leases	(746)		(1,445)
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 717		$ 1,387
Weighted-average remaining lease term - finance leases	8 months 11 days		8 months 11 days
Weighted-average remaining lease term - operating leases	1 year 2 months		1 year 2 months
Weighted-average discount rate - finance leases	4.08%		4.08%
Weighted-average discount rate - operating leases	13.33%		13.33%

Capitalized Operating Lease Cost

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Lessee, Cash Paid For Amounts Included In Measurement Of Lease Liabilities [Abstract]

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Amount of interest expense on finance lease liability.

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Amount of interest paid on finance lease liability.

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Amount of cash outflow for principal payment on finance lease.

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Weighted average discount rate for finance lease calculated at point in time.

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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Amount of sublease income excluding finance and operating lease expense.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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