Recently Issued Accounting Standards, Not Adopted at December 31, 2018 (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction in other liabilities		$ (41,025)	$ (30,130)
Accounting Standards Update 2016-02 | Scenario, Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities	$ 33,000
Right-of-use assets, operating leases	29,000
Reduction in other liabilities	$ 4,000