Long-Term Debt and Credit Facility (Details) (USD $)	3 Months Ended		0 Months Ended	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jul. 02, 2013	Mar. 31, 2013	Dec. 31, 2014	Jul. 01, 2013	Dec. 31, 2013	Sep. 30, 2014	Jan. 31, 2012	Jul. 31, 2013
Debt Instrument [Line Items]
Amount retired under prior credit facility						$ 232,300,000
Amount of cash on hand to fund transactions						7,000,000
Actual financial leverage ratio	2.95
Proceeds from line of credit	26,000,000	0
Other Long-term Debt	3,900,000				12,400,000
Other Loans Payable	100,000				100,000
Letters of credit issued and outstanding	27,200,000
Long-term debt, fair value	373,700,000				377,000,000
Initial maximum financial leverage ratio	3.50	3.75
Remaining borrowing capacity	68,700,000
Minimum permitted fixed charge coverage ratio	1.25
Actual fixed charge coverage ratio	1.40
Insurance Carriers Collateral [Member]
Debt Instrument [Line Items]
Letters of credit issued and outstanding	10,200,000
Work Performance Obligations [Member]
Debt Instrument [Line Items]
Letters of credit issued and outstanding	17,000,000
Bayou Wasco [Member]
Debt Instrument [Line Items]
Due from Joint Ventures	16,600,000
Bayou Wasco [Member] | Wasco Energy [Member]
Debt Instrument [Line Items]
Due from Joint Ventures	9,600,000
BPPC [Member]
Debt Instrument [Line Items]
Due from Joint Ventures	14,200,000
Initial [Member] | Bayou Wasco [Member]
Debt Instrument [Line Items]
Due from Joint Ventures							14,000,000
Initial [Member] | BPPC [Member]
Debt Instrument [Line Items]
Due from Joint Ventures	8,000,000
Additional [Member] | Bayou Wasco [Member]
Debt Instrument [Line Items]
Due from Joint Ventures								2,600,000
Additional [Member] | BPPC [Member]
Debt Instrument [Line Items]
Due from Joint Ventures									6,200,000
2013 Interest Rate Swap [Member]
Debt Instrument [Line Items]
Notional Amount										175,000,000
Fixed interest rate										0.87%
Annualized borrowing rate	2.22%
Brinderson LP [Member]
Debt Instrument [Line Items]
Total consideration recorded			147,600,000
2013 Credit Facility [Member]
Debt Instrument [Line Items]
Face amount of debt										650,000,000
Maximum borrowing capacity										300,000,000
Term of credit facility	5 years
Term of debt instrument	5 years
Secured Debt	286,300,000				319,400,000					350,000,000
Amount drawn on credit facility	71,500,000				45,500,000	35,500,000
Annual mandatory prepayment, percent of Excess Cash Flow	50.00%
Minimum Consolidated Leverage Ratio required	2.50
Actual financial leverage ratio					2.90
Term loan repayment				26,500,000
Proceeds from line of credit				26,000,000
Derivative, Amount of Hedged Item										$ 175,000,000
2013 Credit Facility [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Interest rate at period end	1.92%
2013 Credit Facility [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
2013 Credit Facility [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%