Commitments and Contingencies (Details) - USD ($)		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Contractual Commitments, Commitment [Line Items]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		$ 100,000
Operating Lease, Payments		8,578	$ 7,793
Lease cost		5,685,000	6,010,000
Variable lease cost		788,000	757,000
Sublease income		(216,000)	(267,000)
Total lease costs		$ 6,403,000	$ 6,628,000
Weighted average remaining lease term - operating leases (in years)		5 years 1 month 9 days	5 years 8 months 23 days
Weighted average discount rate - operating leases		4.14%	4.15%
Future minimum annual lease and service payments
Total lease liability		$ 91,835,000		$ 97,581,000
Operating lease liabilities		91,835,000		$ 97,581,000
Equipment Leases
Contractual Commitments, Commitment [Line Items]
Short-term lease cost		0
Future minimum annual lease and service payments
2020		280,000
2021		223,000
2022		91,000
2023		3,000
2024		0
Thereafter		0
Future minimum annual lease and service payments		597,000
Less discount		49,000
Total lease liability		548,000
Lessee, Operating Lease, Liability, Payments, Due		597,000
Less discount		49,000
Operating lease liabilities		548,000
Service Payments
Contractual Commitments, Commitment [Line Items]
Contractual Obligation, Due in Next Fiscal Year		20,251,000
Contractual Obligation, Due in Second Year		17,787,000
Contractual Obligation, Due in Third Year		9,991,000
Contractual Obligation, Due in Fourth Year		4,095,000
Contractual Obligation, Due in Fifth Year		1,938,000
Contractual Obligation, Due after Fifth Year		4,401,000
Contractual Obligation		58,463,000
Facility Leases
Contractual Commitments, Commitment [Line Items]
Short-term lease cost		146,000	$ 128,000
Future minimum annual lease and service payments
2020	[1],[2]	16,006,000
2021	[1],[2]	24,373,000
2022	[1],[2]	20,850,000
2023	[1],[2]	17,595,000
2024	[1],[2]	14,774,000
Thereafter	[1],[2]	10,084,000
Future minimum annual lease and service payments	[1],[2]	103,682,000
Less discount		12,249,000
Total lease liability	[1]	91,287,000
Lessee, Operating Lease, Liability, Payments, Due	[1],[2]	103,682,000
Less discount		12,249,000
Operating lease liabilities	[1]	$ 91,287,000

[1] During the three months ended March 31, 2020, the Company recognized operating right-of-use assets and leases liabilities of $0.1 million for equipment leases.

[2] The Company has entered into various agreements to sublease certain of its premises.