Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Long-term Debt	$ 1,402,840		$ 1,300,000
Long-term Debt, Fair Value	$ 1,400,000		$ 1,300,000
Derivative, Description of Terms	Company pays a fixed rate of interest and receives a floating rate of interest equal to the one month LIBOR
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	$ 1,545	$ (6,694)
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net	0	0
Amount of losses reclassified from accumulated other comprehensive income (loss) to interest expense	800	$ 1,000
Net unrealized losses in accumulated other comprehensive income (loss) expected to be reclassified to interest expense within the next 12 months	$ 1,200