Debt and Financing Arrangements (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016		Oct. 01, 2014	Sep. 27, 2013
Debt Instrument [Line Items]
Long-term debt	$ 0		$ 0		$ 178,125,000	[1]
Financial Liabilities:
Effect of 1% in increase on borrowing rate (less than)	100,000		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)	653,888		653,888		$ 1,841,970
Other, Net [Member]
Debt Instrument [Line Items]
Payments of financing costs	700,000	$ 800,000	2,300,000	$ 2,500,000
Other, Net [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Interest expense	300,000	$ 500,000	$ 1,200,000	$ 1,600,000
LIBOR Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			2.24%
Term Loan [Member]
Debt Instrument [Line Items]
Partial repayment of debt	8,100,000
Term Loan and Revolving Facility [Member]
Debt Instrument [Line Items]
Partial repayment of debt	10,000,000		$ 78,800,000
Revolving Facility [Member]
Debt Instrument [Line Items]
Principal amount								$ 150,000,000
Long-term debt	0		0
Term Loan [Member]
Debt Instrument [Line Items]
Principal amount								150,000,000
Long-term debt	106,900,000		106,900,000
Annual principal repayments	$ 7,500,000		$ 7,500,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Additional principal amount available								75,000,000
Swing Loans [Member]
Debt Instrument [Line Items]
Additional principal amount available								20,000,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Additional principal amount available								$ 20,000,000

[1] Note: The condensed consolidated balance sheet at December 31, 2016 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.