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Unaudited Condensed 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
Statements of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 13,677 | $ 15,002 | $ 28,460 | $ 32,233
Other comprehensive income: |  |  |  |
Change in fair value of derivative instrument, net of income tax | (170) | 883 | (95) | 1,022
Comprehensive income | $ 13,507 | $ 15,885 | $ 28,365 | $ 33,255

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