Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Consolidated Statements of Comprehensive Income
Net income	$ 1,535
Derivative instruments
Unrealized losses on derivative instruments	(4,311)
Reclassification adjustment for losses included in termination of derivative instruments	10,143
Reclassification adjustment for losses included in net income	6,037
Net gain recognized in other comprehensive income	11,869
Tax expense related to items of other comprehensive income	(4,208)
Other comprehensive income	7,661
Total comprehensive income	$ 9,196