Debt and Interest Rate Swap Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 24, 2014	Dec. 31, 2013
Borrowings under credit agreement					$ 255,000,000
Term loan spread basis points	112.5		112.5
Line of credit facility, maximum borrowing capacity					200,000,000
Line of credit facility, current borrowing capacity	200,000,000		200,000,000
Line of credit facility, facility fee basis points	12.5		12.5
Line of Credit Facility Spread Basis Points	100		100
Term loan, annual fixed rate associated with the swap	3.521%		3.521%
Term loan covered by the swap	191,300,000		191,300,000
Amortization of the Swap	63,800,000		63,800,000
Liability on swap agreement	1,180,000		1,180,000			5,061,000
Amount of swap liability to be charged to Debt expense during next twelve months	1,200,000		1,200,000
Amount of swap liability charged to Debt expense during the period	1,100,000	1,600,000	4,000,000	4,900,000
Other Current Liabilities [Member]
Liability on swap agreement	1,180,000		1,180,000
Term loan quarterly payment first four years
Required principal payments			6,400,000
Term loan quarterly payment year five
Required principal payments			36,700,000
Term loan payment due upon expiration
Required principal payments			$ 36,700,000