Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Gains and Losses on Cash Flow Hedges	Sep. 30, 2013 Gains and Losses on Cash Flow Hedges
Accumulated other Comprehensive Income [Roll Forward]
Balance at beginning of period	$ 1,340	$ 521	$ 1,418	$ 521
Other comprehensive income before reclassifications			196	808
Amounts reclassified from accumulated other comprehensive income			(274)	11
Net other comprehensive income			(78)	819
Balance as of September 30, 2013	$ 1,340	$ 521	$ 1,340	$ 1,340