Long-Term Debt and Credit Facility (Credit Facility) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	May. 10, 2013
Debt Instrument [Line Items]
Credit facility, financial covenant, fixed charge coverage ratio	1.10
Fixed charge coverage ratio calculation, maximum impairment and stock compensation expense excluded from adjusted EBITDA	$ 23,000,000
Fixed charge coverage ratio calculation, excluded amount of unfunded capital expenditures in 2015	7,500,000
Fixed charge coverage ratio calculation, excluded amount of unfunded capital expenditures in 2016	$ 5,000,000
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 EBITDA is due	60 days
Term loan [Member]
Debt Instrument [Line Items]
Face amount		$ 50,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 75,000,000.0