Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accrued Liabilities [Abstract]
Accrued expenses	$ 60,213	$ 55,655
Accrued employee compensation and related expenses	72,618	75,232
Accrued taxes	25,058	28,439
Accrued customer programs	45,849	36,025
Accrued liabilities	$ 203,738	$ 195,351