Accumulated OCI (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated OCI, net of tax Beginning Balance			$ (407)	$ (929)
Other comprehensive loss before reclassifications, net of tax			257	(550)
Amounts reclassified from accumulated OCI, net of tax			154	713
Net increase (decrease) in other comprehensive income (loss), net of tax			411	163
Accumulated OCI, net of tax Ending Balance	4	(766)	4	(766)
Reclassification adjustments out of AOCI [Abstract]
Reclassification to interest expense	(4,516)	(3,158)	(8,899)	(6,479)
Amounts reclassified from accumulated other comprehensive income to: [Member]
Reclassification adjustments out of AOCI [Abstract]
Reclassification to interest expense			256	1,180
Tax effect of reclassification			(102)	(467)
Reclassification Adjustment on Derivatives Included in Net Income			154	713
Net Change in Fair Value of Interest Rate Swaps [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated OCI, net of tax Beginning Balance			(513)	(1,790)
Other comprehensive loss before reclassifications, net of tax			(150)	421
Amounts reclassified from accumulated OCI, net of tax			154	713
Net increase (decrease) in other comprehensive income (loss), net of tax			4	1,134
Accumulated OCI, net of tax Ending Balance	(509)	(656)	(509)	(656)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated OCI, net of tax Beginning Balance			106	861
Other comprehensive loss before reclassifications, net of tax			407	(971)
Amounts reclassified from accumulated OCI, net of tax			0	0
Net increase (decrease) in other comprehensive income (loss), net of tax			407	(971)
Accumulated OCI, net of tax Ending Balance	$ 513	$ (110)	$ 513	$ (110)