Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Loss) (Details)

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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss)  
Balance at the beginning of the period $ (12,243)
Unrealized loss on derivatives recognized through Accumulated other comprehensive income (loss) (909)
Reclassifications of unrealized loss on derivatives into net income 1,168
Balance at the end of the period $ (11,984)