Leases (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Weighted average remaining lease term for operating leases	4 years 1 month 6 days	4 years 1 month 6 days
Weighted average discount rate for operating leases	4.80%	4.80%
Components of Lease Expense [Abstract]
Operating lease cost	$ 12,417	$ 25,278
Short-term lease cost	52	104
Variable lease cost	1,105	2,157
Total lease expense	13,574	27,539
Operating right-of-use assets	118,507	118,507	$ 0
Current operating lease liabilities	37,200	37,200
Long-term operating lease liabilities	84,102	84,102	0
Supplemental Cash Flow Information Related to Leases [Abstract]
Operating cash outflow from operating leases		26,570
ROU assets obtained in exchange for lease obligations		140,585
Maturities of Operating Lease Liabilities [Abstract]
2019	23,632	23,632
2020	37,424	37,424
2021	30,478	30,478
2022	16,439	16,439
2023	11,574	11,574
Thereafter	15,514	15,514
Total	135,061	135,061
Less: Finance charges	13,794	13,794
Total principal liability	121,267	121,267
Additional lease liabilities not yet commenced	$ 200	$ 200
Operating Leases, Minimum Future Obligations [Abstract]
2019			39,358
2020			27,553
2021			20,266
2022			11,723
2023			9,950
Thereafter			7,628
Total minimum lease payments			116,478
Financing Obligations, Minimum Future Obligations [Abstract]
2019			726
2020			748
2021			757
2022			770
2023			794
Thereafter			1,148
Total minimum lease payments			$ 4,943
Minimum [Member]
Leases [Abstract]
Remaining lease terms		1 year
Maximum [Member]
Leases [Abstract]
Remaining lease terms		15 years
Extension period for leases		10 years
Termination period for leases		1 year