Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net income $ 63,270 $ 69,903
Other comprehensive loss:    
Foreign currency translation adjustments (5,311) (781)
Comprehensive income $ 57,959 $ 69,122