Long-Term Debt and Credit Facility (Credit Facility) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	May 10, 2013
Debt Instrument [Line Items]
Credit facility, financial covenant, EBIDTDA to debt ratio, upper range	1.10
Credit facility, financial covenant, funded debt to adjusted EBITDA ratio	4.0
Annual limit on capital expenditures	$ 36,000,000
Covenant, Percent of Adjusted EBITDA Which Must Be Prepaid	25.00%
Credit Facility Ceiling Value, Applicable to 25% Of Adjusted EBITDA Which Must Be Paid	3,000,000.0
Covenant, Maximum Number of Days From Year End By Which Prepayment of 25% of Adjusted EBTDA is Due	60 days
Excess Cash Flow Minimum Achieved Under Loan Covenant	3,000,000
Amount Company Will Prepay on Term Loan Due To Covenant Requirement	3,000,000
Term loan [Member]
Debt Instrument [Line Items]
Face amount	50,000,000	50,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 75,000,000.0	$ 75,000,000.0