Commitments and Contingencies (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Lease Obligations
Net rent expense		$ 6,600,000	$ 6,300,000	$ 19,500,000	$ 16,300,000
Future minimum annual lease and service payments
Sublease income related to operating leases		400,000	$ 200,000	1,100,000	$ 800,000
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		6,200,000		6,200,000		$ 6,200,000
Equipment Leases
Future minimum annual lease and service payments
2018	[1]	966,000		966,000
2019	[1]	2,482,000		2,482,000
2020	[1]	1,529,000		1,529,000
2021	[1]	1,392,000		1,392,000
2022	[1]	1,128,000		1,128,000
Thereafter	[1]	374,000		374,000
Future minimum annual lease and service payments	[1]	7,871,000		7,871,000
Service Payments
Future minimum annual lease and service payments
2018		6,762,000		6,762,000
2019		19,256,000		19,256,000
2020		5,796,000		5,796,000
2021		1,722,000		1,722,000
2022		1,350,000		1,350,000
Thereafter		1,470,000		1,470,000
Future minimum annual lease and service payments		36,356,000		36,356,000
Facility Leases
Future minimum annual lease and service payments
2018	[2]	6,453,000		6,453,000
2019	[2]	24,508,000		24,508,000
2020	[2]	20,907,000		20,907,000
2021	[2]	20,640,000		20,640,000
2022	[2]	17,464,000		17,464,000
Thereafter	[2]	28,353,000		28,353,000
Future minimum annual lease and service payments	[2]	$ 118,325,000		$ 118,325,000

[1] Equipment Leases include the Company's commitments relating to operating and capital leases. See Note 17 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 $0.4 million and $0.2 million for the three months ended September 30, 2018 and 2017, and $1.1 million and $0.8 million for the nine months ended September 30, 2018 and 2017, respectively.