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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Foreign currency translation adjustment, tax $ 0 $ 0 $ 0 $ 0
Unrealized gain on derivative instruments, tax $ 0 $ 0 0 0
Minimum pension liability adjustment, tax     $ 0 $ 0