Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Recent Accounting Pronouncements [Line Items]
Operating lease, right-of-use asset	$ 113,319	$ 115,900
Operating lease payment obligation	$ 128,718	130,700
Accounting Standards Update 2016-02 [Member]
Recent Accounting Pronouncements [Line Items]
Operating lease, right-of-use asset		116,000
Operating lease payment obligation		131,000
Deferred rent liabilities		$ 15,000