Debt and Financing Arrangements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 31, 2015	Oct. 01, 2014	Sep. 27, 2013
Debt Instrument [Line Items]
Amount outstanding	$ 0	$ 178,125,000
Financial Liabilities:
Effect of 1% increase on borrowing rate to interest expense (less than $0.1 million)	100,000			$ 100,000
Interest Rate Swap
Debt Instrument [Line Items]
Amount of hedged item					$ 150,000,000
Interest rate of derivative					1.89%
Notional amount of derivative liability	150,000,000	150,000,000	$ 150,000,000		$ 150,000,000
Derivative expense	1,300,000	2,100,000
Interest Rate Swap | Level 2
Financial assets:
Interest Rate Swap Asset	0	0	0
Financial Liabilities:
Interest Rate Swap Liability (Other Accrued Liabilities)	230,845	1,841,970	$ 2,947,438
Other, net
Debt Instrument [Line Items]
Payments of financing charges	$ 3,000,000	3,500,000
LIBOR Rate
Debt Instrument [Line Items]
Basis spread on variable rate	2.57%
Term Loan and Revolving Facility
Debt Instrument [Line Items]
Extinguishment of debt amount	$ 107,600,000	$ 47,500,000
Term Loan
Debt Instrument [Line Items]
Extinguishment of debt amount	100,000,000
Revolving Facility
Debt Instrument [Line Items]
Extinguishment of debt amount	40,000,000
Credit Agreement
Debt Instrument [Line Items]
Additional principal amount available (up to)						$ 75,000,000
Revolving Facility
Debt Instrument [Line Items]
Principal amount						150,000,000
Amount outstanding	0
Available borrowing capacity	149,300,000
Term Loan
Debt Instrument [Line Items]
Principal amount						150,000,000
Amount outstanding	$ 78,000,000
Swing Loans
Debt Instrument [Line Items]
Additional principal amount available (up to)						20,000,000
Letters of Credit
Debt Instrument [Line Items]
Additional principal amount available (up to)						$ 20,000,000