Commitments and Contingencies (Details) - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Lease Obligations
Net rent expense		$ 26,000,000	$ 22,600,000	$ 20,300,000
Future minimum annual lease and service payments
Sublease income related to operating leases		1,400,000	1,100,000	$ 2,200,000
Clawback Obligation
Future minimum annual lease and service payments
Contractual obligation			6,200,000
RCG Longview Partners II, LLC | Clawback Obligation
Future minimum annual lease and service payments
Contractual obligation		6,500,000	$ 6,200,000
Equipment Leases
Future minimum annual lease and service payments
2019	[1]	2,434,000
2020	[1]	1,492,000
2021	[1]	1,382,000
2022	[1]	1,123,000
2023	[1]	374,000
Thereafter	[1]	0
Future minimum annual lease and service payments	[1]	6,805,000
Service Payments
Future minimum annual lease and service payments
2019		21,758,000
2020		7,514,000
2021		1,877,000
2022		1,372,000
2023		735,000
Thereafter		735,000
Future minimum annual lease and service payments		33,991,000
Facility Leases
Future minimum annual lease and service payments
2019	[2]	24,584,000
2020	[2]	22,608,000
2021	[2]	22,321,000
2022	[2]	19,166,000
2023	[2]	16,204,000
Thereafter	[2]	21,478,000
Future minimum annual lease and service payments	[2]	$ 126,361,000

[1] Equipment Leases include the Company's commitments relating to operating and capital leases. See Note 23 for further information on the capital lease minimum payments which are included in the table.

[2] The Company has entered into various agreements to sublease certain of its premises. The Company recorded sublease income related to these leases of $1.4 million, $1.1 million, and $2.2 million for the years ended December 31, 2018, 2017, and 2016 respectively.