Commitments and Contingencies (Details) - USD ($)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Lease Obligations
Net rent expense		$ 22,600,000	$ 20,300,000	$ 18,500,000
Future minimum annual lease and service payments
Sublease income related to operating leases		1,100,000	2,200,000	$ 2,300,000
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
Equipment Leases
Future minimum annual lease and service payments
Contractual Obligation, Due in next fiscal year	[1]	3,511,000
Contractual Obligation, Due in Second Year	[1]	1,599,000
Contractual Obligation, Due in Third Year	[1]	669,000
Contractual Obligation, Due in Fourth Year	[1]	639,000
Contractual Obligation, Due in Fifth Year	[1]	420,000
Thereafter	[1]	0
Future minimum annual lease and service payments	[1]	6,838,000
Service Payments
Future minimum annual lease and service payments
Contractual Obligation, Due in next fiscal year		21,631,000
Contractual Obligation, Due in Second Year		10,987,000
Contractual Obligation, Due in Third Year		1,539,000
Contractual Obligation, Due in Fourth Year		337,000
Contractual Obligation, Due in Fifth Year		0
Thereafter		0
Future minimum annual lease and service payments		34,494,000
Facility Leases
Future minimum annual lease and service payments
Contractual Obligation, Due in next fiscal year	[2]	25,960,000
Contractual Obligation, Due in Second Year	[2]	21,453,000
Contractual Obligation, Due in Third Year	[2]	17,626,000
Contractual Obligation, Due in Fourth Year	[2]	17,592,000
Contractual Obligation, Due in Fifth Year	[2]	11,942,000
Thereafter	[2]	7,354,000
Future minimum annual lease and service payments	[2]	$ 101,927,000

[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 $1.1 million, $2.2 million, and $2.3 million and for the years ended December 31, 2017, 2016, and 2015 respectively.