Equity (Comprehensive Income) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Prior service cost	$ 647	$ 661
Transition asset	0	0
Unrecognized net actuarial loss	(10,090)	(10,201)
Derivative, Fair Value, Net	(1,887)	(998)
Total accumulated other comprehensive income (loss)	$ (11,330)	$ (10,538)