Leases (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Right of use asset	$ 75,176
Lease liability	$ 75,429
Option to extend operating lease	true
Option to terminate operating lease	true
Weighted average remaining lease term	6 years
Weighted average discount rate	3.96%
Operating lease expenses	$ 20,100
Short term lease expenses	20,000
Cash paid related to operating lease obligations	20,500
Right-of-use assets obtained in exchange for operating lease liabilities	$ 16,100
Payments for Rent		$ 21,100	$ 18,900
Accounting Standards Update 2016-02 [Member] | Restatement Adjustment [Member]
Right of use asset				$ 76,300