Revolving Credit Facility and Long-Term Debt - Narrative (Details) (USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2014 quarter	Dec. 19, 2012	Dec. 31, 2013	Oct. 04, 2013	Sep. 30, 2010
Credit Agreement
Line of Credit Facility [Line Items]
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Current Quarter, Maximum	4.75
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Quarter One, Maximum	4.00
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Quarter Two, Maximum	3.75
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Quarter Three, Maximum	3.50
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Quarter Four, Maximum	3.25
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Year Two, Maximum	3
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Year Three, Maximum	2.75
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Year Four, Maximum	2.5
Line of Credit Facility, Covenant Terms, Consolidated EBITDA to Fixed Charges Ratio, Number of Consecutive Quarters	4
Line of Credit Facility, Covenant Terms, Consolidated EBITDA to Fixed Charges Ratio, Minimum	1.75
Line of Credit Facility, Covenant Terms, Consolidated Net Income, Maximum	$ 0
Line of Credit Facility, Covenant Terms, Facility Capital Expenditures, Next Twelve Months, Maximum	30,000,000
Line of Credit Facility, Amount Outstanding	224,500,000
Line of Credit Facility, Remaining Borrowing Capacity	27,500,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	2.9825%		4.2325%
Long-term Debt, Percentage Bearing Fixed Interest, Amount	140,000,000		145,000,000
Base Rate | Credit Agreement
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.25%	1.00%
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Minimum	2.25
London Interbank Offered Rate (LIBOR) Market Index Rate | Credit Agreement
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%	2.00%
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Minimum	2.25
London Interbank Offered Rate (LIBOR) | Credit Agreement
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%	2.00%
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Minimum	2.25
Debt Instrument, Basis Spread on Base Rate	0.01
Federal Funds Rate | Credit Agreement
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Base Rate	0.0050
Variable Rate 1 | Credit Agreement
Line of Credit Facility [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	2.17%		3.42%
Long-term Debt, Percentage Bearing Variable Interest, Amount	84,300,000		101,500,000
Variable Rate 2 | Credit Agreement
Line of Credit Facility [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	2.26%		3.50%
Long-term Debt, Percentage Bearing Variable Interest, Amount	174,000		2,400,000
Revolving Credit Facility | Credit Agreement
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				215,000,000
Revolving Credit Facility | Wells Fargo
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					175,000,000
Term Loan | Credit Agreement
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		100,000,000
Bridge Loan | Base Rate | Credit Agreement
Line of Credit Facility [Line Items]
Line of Credit Facility, Covenant Terms, Consolidated Total Leverage Ratio, Minimum	2.25
Bridge Loan | London Interbank Offered Rate (LIBOR) Market Index Rate | Credit Agreement
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%	2.00%