Leases (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019
Right of use asset	$ 77,868	$ 77,868
Lease liability	$ 78,156	$ 78,156
Option to extend operating lease		true
Option to terminate operating lease		true
Weighted average remaining lease term	6 years 4 months 24 days	6 years 4 months 24 days
Weighted average discount rate	4.00%	4.00%
Operating lease expenses	$ 5,100	$ 9,800
Short term lease expenses	5,400	9,800
Cash paid related to operating lease obligations	5,100	9,900
Right-of-use assets obtained in exchange for operating lease liabilities	$ 9,900	$ 9,900
Accounting Standards Update 2016-02 [Member] | Restatement Adjustment [Member]
Right of use asset			$ 76,300
Lease liability			$ 76,300