Summary of Significant Accounting and Reporting Policies (Narrative) (Details)			12 Months Ended
	Dec. 31, 2014	Dec. 05, 2014	Dec. 31, 2016 USD ($) plan shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	Mar. 31, 2016 USD ($)
Summary Of Significant Accounting And Reporting Policies [Line Items]
Allowance for obsolete and slow moving inventories			$ 6,100,000	$ 8,200,000
Depreciation expense			66,300,000	58,100,000	$ 55,300,000
Advertising and promotional costs			1,900,000	1,400,000	1,100,000
Repair and maintenance of plant and equipment			$ 22,100,000	$ 20,700,000	$ 17,900,000
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be antidilutive | shares			1,985,849	1,656,936	1,228,694
Deferred tax assets, current			$ 0	$ (24,366,588)
Deferred tax liability, non-current			71,212,620	69,524,621
Tax benefits associated with the exercise, vesting or disposition of stock under stock plans recognized as an adjustment of additional paid-in capital			11,800,000	5,000,000	$ 10,800,000
Accounting Standards Update 2016-09 [Member]
Summary Of Significant Accounting And Reporting Policies [Line Items]
Tax benefits associated with the exercise, vesting or disposition of stock under stock plans recognized as an adjustment of additional paid-in capital			$ 4,300,000	$ 2,300,000	$ 5,000,000
Accounting Standards Update 2015-17 [Member]
Summary Of Significant Accounting And Reporting Policies [Line Items]
Deferred tax liability, non-current						$ 27,000,000
Common Stocks
Summary Of Significant Accounting And Reporting Policies [Line Items]
Common stock split conversion ratio	2	2
Common stock split, stock dividend percent	100.00%	100.00%
Buildings and improvements | Minimum
Summary Of Significant Accounting And Reporting Policies [Line Items]
Minimum estimated useful life, in years			7 years
Buildings and improvements | Maximum
Summary Of Significant Accounting And Reporting Policies [Line Items]
Minimum estimated useful life, in years			30 years
Machinery and equipment | Minimum
Summary Of Significant Accounting And Reporting Policies [Line Items]
Minimum estimated useful life, in years			3 years
Machinery and equipment | Maximum
Summary Of Significant Accounting And Reporting Policies [Line Items]
Minimum estimated useful life, in years			10 years
Employee Stock Option [Member]
Summary Of Significant Accounting And Reporting Policies [Line Items]
Number of plans | plan			2