Commitments and Contingencies (Minimum Rentals) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
Long-term debt maturities, 2019	$ 19,053
Long-term debt maturities, 2020	20,711
Long-term debt maturities, 2021	22,594
Long-term debt maturities, 2022	28,242
Long-term debt maturities, 2023	629,162
Long-term debt maturities, Thereafter	0
Total Debt	719,762
Less: current portion	(19,053)
Long-term obligations, Debt	700,709
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Capital Leases, future minimum payments due, 2019	266
Capital Leases, future minimum payments due, 2020	96
Capital Leases, future minimum payments due, 2021	89
Capital Leases, future minimum payments due, 2022	67
Capital Leases, future minimum payments due, 2023	15
Capital Leases, future minimum payments due, Thereafter	0
Total capital lease obligations	533
Less: amount representing interest	(63)
Present value of obligations under capital leases	470
Less: current portion	(239)
Long-term obligations, Capital Leases	231
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, future minimum payments due, 2019	34,189
Operating Leases, future minimum payments due, 2020	32,093
Operating Leases, future minimum payments due, 2021	26,675
Operating Leases, future minimum payments due, 2022	23,355
Operating Leases, future minimum payments due, 2023	21,890
Operating Leases, future minimum payments due, Thereafter	3,299
Total operating lease obligations	141,501
Less: sublease income	(1,091)
Net lease payments	140,410
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase Obligation,future minimum payments due, 2019	406
Purchase Obligation,future minimum payments due, 2020	0
Purchase Obligation, future minimum payments due, 2021	0
Purchase Obligation, future minimum payments due, 2022	0
Purchase Obligation, future minimum payments due, 2023	0
Purchase Obligation, future minimum payments due, Thereafter	0
Total Purchase Obligation	$ 406

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