Debt and Financing Arrangements (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Oct. 01, 2014	Sep. 27, 2013
Debt Instrument [Line Items]
Long-term debt	$ 254,375,000		$ 254,375,000		$ 258,125,000
Financial Liabilities:
Effect of 1% in increase on borrowing rate	1,100,000		1,100,000
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Amount of hedged item						$ 150,000,000
Notional amount of derivative	150,000,000		150,000,000		150,000,000	$ 150,000,000
Fixed interest rate of derivative						1.89%
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets:
Interest Rate Swap Asset	0		0		0
Financial Liabilities:
Interest Rate Swap Liability (Other Accrued Liabilities)	3,343,622		3,343,622		$ 1,475,702
Other, Net [Member]
Debt Instrument [Line Items]
Payments of financing costs	800,000	$ 900,000	$ 1,700,000	$ 1,700,000
LIBOR Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.19%
Term Loan and Revolving Facility [Member]
Debt Instrument [Line Items]
Partial repayment of debt	1,900,000		$ 3,800,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Additional principal amount available							$ 75,000,000
Revolving Facility [Member]
Debt Instrument [Line Items]
Principal amount							150,000,000
Long-term debt	125,000,000		125,000,000
Available borrowing capacity	25,000,000		25,000,000
Term Loan [Member]
Debt Instrument [Line Items]
Principal amount							150,000,000
Long-term debt	136,900,000		136,900,000
Annual principal repayments	$ 7,500,000		$ 7,500,000
Swing Loans [Member]
Debt Instrument [Line Items]
Additional principal amount available							20,000,000
Letters of Credit [Member]
Debt Instrument [Line Items]
Additional principal amount available							$ 20,000,000