Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Consolidated Statements of Comprehensive Income
Net income	$ 2,214	$ 9,692	$ 6,545	$ 11,302
Derivative instruments
Unrealized loss on derivative instruments		(58)		(49)
Reclassification adjustment for (gains) losses included in net income	(124)	393	(249)	759
Net gain (loss) recognized in other comprehensive income	(124)	335	(249)	710
Tax benefit (expense) related to items of other comprehensive income	46	(122)	91	(260)
Other comprehensive income (loss)	(78)	213	(158)	450
Total comprehensive income	$ 2,136	$ 9,905	$ 6,387	$ 11,752