Goodwill and Other Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2013
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Goodwill	$ 307,365,845	$ 307,365,845
Amortization expense	22,500,000	22,300,000	$ 22,500,000
Patents and Other Intangible Assets [Member]
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ 101,000,000	79,200,000
Finite-lived intangible asset, useful life	10 years
Amortization expense, 2018	$ 22,000,000
Amortization expense, 2019	22,000,000
Amortization expense, 2020	22,000,000
Amortization expense, 2021	22,000,000
Amortization expense, 2022	21,000,000
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Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Goodwill				$ 307,400,000
Accumulated amortization	$ 82,025,000	$ 62,725,000