Commitments and Contingencies - Agreements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Future Lease Obligations
2019	$ 44,295
2020	39,771
2021	37,722
2022	35,554
2023	31,110
Thereafter	125,863
Future minimum rental payments under non-cancelable operating leases	314,315
Rent expense	14,200	$ 9,400
Future minimum rental payments under non-cancelable capital leases
2019	3,522
2020	1,033
2021	654
2022	165
Future minimum rental payments under non-cancelable capital leases	5,374
2019	2,500
2020	2,100
Advertising Expense	13,900	9,500
Letters of Credit
Outstanding letters of credit	15,900	$ 130
License Agreements
Future minimum rental payments under non-cancelable capital leases
2019	121,843
2020	98,597
2021	78,061
2022	36,567
2023	30,396
Thereafter	119,655
Total	485,119
Royalty Expense	34,500
Advertising Expense	$ 4,100