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Condensed Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Consolidated Statement of Comprehensive Income (Loss) [Abstract]        
Net income $ 15,593 $ 6,818 $ 23,847 $ 14,203
Foreign currency translation adjustment (1,442) (1,575) (3,036) (1,871)
Comprehensive income $ 14,151 $ 5,243 $ 20,811 $ 12,332