Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Thousands	Jan. 01, 2018	Mar. 31, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease liabilities		$ 22,368
Operating lease liabilities		85,297
ASU 2016-02 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease, right-of- use asset		84,000
Operating lease liabilities		22,400
Operating lease liabilities		$ 85,300
Operating lease, term		12 months
ASU 2014-09 [Member] | Retained Earnings [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net increase to retained earnings	$ 200