Equity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Loss
Cumulative foreign currency translation adjustment	$ 697	$ (6,955)
Unrealized gains (losses) on cash flow hedges, net	(18,989)	(13,950)
Supplemental Executive Retirement plan minimum liability and other	(3,015)	(3,119)
Total other comprehensive income (loss)	$ (21,307)	$ (24,024)