Leases - Remaining Lease Term (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases
Rental Expense	$ 4,573	$ 3,531	$ 4,557
Lease, Practical Expedients, Package [true false]	true
Lease, Practical Expedient, Use of Hindsight [true false]	false
Operating lease, existence of option to extend	true
Minimum
Leases
Operating lease, remaining lease term	1 year
Maximum
Leases
Operating lease, remaining lease term	10 years
Operating lease, renewal term	5 years