Debt - Summary of Interest Rate Swaps Activity Recorded in Other Comprehensive Income Before Tax (Details 3) - Interest Rate Swap - Designated as Hedging Instrument - Cash Flow Hedge - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest rate swap activity recorded in Other comprehensive earnings before tax
Unrealized gain (loss)	$ 593	$ (516)	$ (510)
Interest Expense
Interest rate swap activity recorded in Other comprehensive earnings before tax
Realized gain reclassified to interest expense	$ 928	$ 768	$ 488