Leases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Weighted average remaining lease term for operating leases	4 years	4 years
Weighted average discount rate for operating leases	4.80%	4.80%
Components of Lease Expense [Abstract]
Operating lease cost	$ 12,399	$ 37,677
Short-term lease cost	41	145
Variable lease cost	732	2,889
Total lease expense	13,172	40,711
Operating right-of-use assets	115,557	115,557	$ 0
Current operating lease liabilities	37,200	37,200
Long-term operating lease liabilities	80,953	80,953	0
Supplemental Cash Flow Information Related to Leases [Abstract]
Operating cash outflow from operating leases		39,885
ROU assets obtained in exchange for lease obligations		150,127
Maturities of Operating Lease Liabilities [Abstract]
2019	12,801	12,801
2020	39,764	39,764
2021	32,965	32,965
2022	18,419	18,419
2023	11,387	11,387
Thereafter	15,721	15,721
Total	131,057	131,057
Less: Finance charges	12,860	12,860
Total principal liability	118,197	118,197
Additional lease liabilities not yet commenced	$ 13,300	$ 13,300
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