Application of Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 22, 2017	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of rate changes on deferred income taxes	$ 78,145
Accumulated other comprehensive income (loss)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of rate changes on deferred income taxes		$ 78,145