Recently Adopted and Recently Issued Accounting Standards - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Defined benefit pension income (expense)	$ (3,447)	$ 2,595	$ 1,414
Adjustment to opening retained earnings (less than)				$ (2,374)	$ (397)
Stranded income tax effects		21,000
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to opening retained earnings (less than)		$ 100		$ (3,894)	$ 709