Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Payroll and related items	$ 60,647	$ 75,869
Management incentive compensation	6,637	24,320
Income taxes payable	24,800	28,033
Insurance	9,764	9,424
Warranty	6,239	6,281
Deferred revenue	12,586	11,031
Restructuring	3,415	4,180
Liability for uncertain tax positions	1,484	1,745
Accrued interest	10,440	1,759
Other	22,144	22,063
Total accrued expenses	$ 158,156	$ 184,705