Income Taxes (Details 2) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets (liabilities)
Deferred revenue	$ 25,300,000	$ 25,700,000
Warranty reserves	5,600,000	4,300,000
Inventory reserves	10,900,000	9,000,000
Allowance for doubtful accounts	4,600,000	3,800,000
Employee benefits	41,500,000	41,400,000
Foreign loss carry forwards	1,900,000	3,700,000
Deferred state tax attributes	16,200,000	15,800,000
Other, net	(1,400,000)	2,300,000
Gross deferred assets	104,600,000	106,000,000
Valuation allowances	(4,300,000)	(9,600,000)
Deferred tax assets after valuation allowances	100,300,000	96,400,000
Depreciation	(46,500,000)	(43,800,000)
Amortization	(55,100,000)	(47,300,000)
Acquired identifiable intangibles	(142,400,000)	(136,200,000)
Gross deferred liabilities	(244,000,000)	(227,300,000)
Net deferred tax liabilities	(143,700,000)	(130,900,000)
Deferred tax assets, federal NOL	0
Deferred tax asset for state tax loss carry forwards	11,900,000
Deferred tax asset for tax loss carry forwards in foreign jurisdictions	1,900,000
Valuation allowance on state tax losses	$ 4,300,000	$ 2,900,000