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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]      
Net income for the year $ 11,828 $ 28,118 $ 22,175
Other comprehensive income:      
Increase (decrease) in fair market value of derivatives 851 (740) 293
Total comprehensive income for the year $ 12,679 $ 27,378 $ 22,468