Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Loss [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			$ (8,446)
Other comprehensive income (loss), before income taxes	2,260	(3,628)	4,112	(4,448)
Income tax expense	(838)	1,343	(1,525)	1,646
Other comprehensive income (loss), net of income taxes	1,422	(2,285)	2,587	(2,802)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(5,859)		(5,859)
Cash Flow Hedging [Member]
Accumulated Other Comprehensive Loss [Roll Forward]
Other comprehensive income (loss) before reclassifications			289
Amounts reclassified from accumulated other comprehensive loss to interest expense			3,823
Other comprehensive income (loss), before income taxes			4,112
Income tax expense			(1,525)
Other comprehensive income (loss), net of income taxes			$ 2,587