Derivative Financial Instruments (The location and effect of the derivative instrument on the condensed consolidated statement of operations, pre-tax basis) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments, (Gain) Loss [Line Items]
Amount of (gain) loss recognized	$ (2,707)	$ (1,263)
Hedged Item Debt [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Amount of (gain) loss recognized	2,490	2,185
Interest Rate Swap [Member] | Interest Expense, Net [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Amount of (gain) loss recognized	$ (5,197)	$ (3,448)