Comprehensive Income (Loss) Components of AOCI (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance	$ 2,716
Net current-period other comprehensive (loss) income	(11,482)	399	(1,339)
Ending balance	(8,766)	2,716
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance	3,513	4,243
Other comprehensive income before reclassifications	(11,145)	0
Amounts reclassified from accumulated other comprehensive income	0	0
Net current-period other comprehensive (loss) income	(11,829)	(730)
Ending balance	(8,316)	3,513
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Interest Expense [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive income	(684)	(730)
Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance	(1,329)	(2,292)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	82	963
Net current-period other comprehensive (loss) income	82	963
Ending balance	(1,247)	(1,329)
Accumulated Defined Benefit Plans Adjustment [Member] | Interest Expense [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive income	0	0
Foreign Currency Gain (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance	532	366
Other comprehensive income before reclassifications	265	166
Amounts reclassified from accumulated other comprehensive income	0	0
Net current-period other comprehensive (loss) income	265	166
Ending balance	797	532
Foreign Currency Gain (Loss) [Member] | Interest Expense [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive income	0	0
Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning balance	2,716	2,317
Other comprehensive income before reclassifications	(10,880)	166
Amounts reclassified from accumulated other comprehensive income	82	963
Net current-period other comprehensive (loss) income	(11,482)	399
Ending balance	(8,766)	2,716
Other Comprehensive Income (Loss) [Member] | Interest Expense [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive income	$ (684)	$ (730)