New Authoritative Accounting Guidance (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease right of use assets	$ 283,348
Lease liabilities	$ 307,405		$ 3,125
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease right of use assets		$ 216,000
Lease liabilities		241,000
Cumulative effect adjustment to retained earnings		4,414
ASU 2016-02 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings		4,414
ASU 2017-08
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings		(1,446)
ASU 2017-08 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings		$ (1,446)