Lease Obligations - Schedule of Lease Costs including Weighted Average Lease Terms and Weighted-average Discount Rates (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Finance cost:
Interest on lease liability (included in Interest expense)	$ 410
Short-term lease cost	27
Variable lease cost	73
Sublease income (included in Rentals, net)	(6,703)
Total lease cost	$ (5,326)
Operating lease, weighted average remaining lease term (in years)	42 years 7 months
Financelease, weighted average remaining lease term (in years)	4 years 9 months
Operating lease, weighted average discount rate, percent	4.90%
Finance lease, weighted average discount rate, percent	7.50%
Operating expense [Member]
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 761
General and administrative expense [Member]
Lessee, Lease, Description [Line Items]
Operating lease cost	61
Depreciation and Amortization [Member]
Finance cost:
Amortization of right-of-use asset (included in Depreciation and Amortization expense)	$ 45