Leases (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Other long-term liabilities		$ 18,436		$ 16,938
Operating lease, not yet commenced, obligation				$ 300
Operating leases, rent expense		$ 6,500	$ 6,100
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Lease, right-of-use asset	$ 20,900
Lease, liability	23,200
Deferred Rent Asset, Net, Current	2,100
Other long-term liabilities	1,000
Tax effect of adoption of new accounting guidance	$ 800
Minimum
Lessee, Lease, Description [Line Items]
Operating lease, not yet commenced, term				2 years
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, not yet commenced, term				4 years