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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]                    
Stockholders' equity attributable to parent $ 911,063 $ 877,796 $ 911,063 $ 877,796 $ 899,504 $ 877,897 $ 866,376 $ 860,787 $ 852,976 $ 837,145
Tax expense (benefit) 307 (108) 905 (487)            
Foreign currency translation adjustment [Member]                    
Accumulated Other Comprehensive Income (Loss) [Line Items]                    
Stockholders' equity attributable to parent (90,475)   (90,475)       (85,279)      
Unrealized gain (loss) on hedged transaction, net of tax [Member]                    
Accumulated Other Comprehensive Income (Loss) [Line Items]                    
Stockholders' equity attributable to parent 283   283       1,102      
Accumulated other comprehensive income (loss) [Member]                    
Accumulated Other Comprehensive Income (Loss) [Line Items]                    
Stockholders' equity attributable to parent $ (90,192) $ (60,650) $ (90,192) $ (60,650) $ (88,045) $ (88,793) $ (84,177) $ (65,405) $ (63,290) $ (73,204)