Debt and Financing Arrangements (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016		Oct. 01, 2014	Sep. 27, 2013
Debt Instrument [Line Items]
Long-term debt	$ 9,375,000		$ 9,375,000			$ 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)	904,955		904,955			$ 1,841,970
Other, Net [Member]
Debt Instrument [Line Items]
Payments of financing costs	700,000	$ 800,000	1,600,000	$ 1,700,000
Other, Net [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Interest expense	400,000	$ 600,000	$ 900,000	$ 1,100,000
LIBOR Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			2.23%
Term Loan and Revolving Facility [Member]
Debt Instrument [Line Items]
Partial repayment of debt	26,900,000		$ 68,800,000
Revolving Facility [Member]
Debt Instrument [Line Items]
Partial repayment of debt	20,000,000
Term Loan [Member]
Debt Instrument [Line Items]
Partial repayment of debt	5,000,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Short-term debt					$ 100,000,000
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	0		0
Term Loan [Member]
Debt Instrument [Line Items]
Principal amount									150,000,000
Long-term debt	116,900,000		116,900,000
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

[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.