Leases (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jan. 01, 2019
Right of use asset	$ 74,843	$ 74,843
Lease liability	$ 75,148	$ 75,148
Option to extend operating lease		true
Option to terminate operating lease		true
Weighted average remaining lease term	6 years	6 years
Weighted average discount rate	4.00%	4.00%
Operating lease expenses	$ 5,200	$ 15,000
Short term lease expenses	5,000	14,800
Cash paid related to operating lease obligations	5,200	15,100
Right-of-use assets obtained in exchange for operating lease liabilities	$ 1,400	$ 11,300
Accounting Standards Update 2016-02 [Member] | Restatement Adjustment [Member]
Right of use asset			$ 76,300
Lease liability			$ 76,300