Long-Term Debt (Details Textual) (USD $)	0 Months Ended	3 Months Ended			1 Months Ended	9 Months Ended	0 Months Ended		9 Months Ended	3 Months Ended			9 Months Ended		9 Months Ended					9 Months Ended
	Feb. 15, 2011	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Apr. 12, 2006 7.125% Senior Notes [Member]	Sep. 30, 2012 7.125% Senior Notes [Member] Subsidiary	Jun. 13, 2011 7.75% Senior Notes [Member]	Feb. 15, 2011 7.75% Senior Notes [Member]	Sep. 30, 2012 7.75% Senior Notes [Member]	Mar. 31, 2011 11.625% Senior Secured Notes [Member]	Sep. 30, 2012 11.625% Senior Secured Notes [Member]	Feb. 28, 2011 11.625% Senior Secured Notes [Member]	Sep. 30, 2012 7.75% Senior Notes Due 2019 Prior To February 15 2014 [Member]	Sep. 30, 2012 7.75% Senior Notes Due 2019 on and after February 15 2015 [Member]	Sep. 30, 2012 Revolving Credit Facility [Member]	Sep. 30, 2012 Maximum [Member] Alternate Base Rate Loans [Member]	Sep. 30, 2012 Maximum [Member] Eurodollar Loans [Member]	Apr. 05, 2012 Maximum [Member] Revolving Credit Facility [Member]	Jul. 15, 2011 Maximum [Member] Revolving Credit Facility [Member]	Sep. 30, 2012 Minimum [Member] Alternate Base Rate Loans [Member]	Sep. 30, 2012 Minimum [Member] Eurodollar Loans [Member]	Apr. 05, 2012 Minimum [Member] Revolving Credit Facility [Member]	Jul. 15, 2011 Minimum [Member] Revolving Credit Facility [Member]	Sep. 30, 2011 Maverick [Member]	Sep. 30, 2012 Maverick [Member] 7.75% Senior Notes [Member]
Long Term Debt (Textual) [Abstract]
Issuance of senior notes					$ 225,000,000		$ 200,000,000	$ 275,000,000	$ 464,600,000
Debt instrument, interest rate			11.625%	11.625%		7.125%			7.75%		11.625%
Debt instrument maturity						2016-04
Debt Instrument, Maturity Date									Feb. 15, 2019
Debt Instrument, Frequency of Periodic Payment						2
Line of credit maturity date															Jan. 15, 2016
Repayment of senior debt	224,700,000
Debt instrument, purchase price as a percentage of principal amount							101.00%	100.00%
Debt instrument, repurchase price, percentage on principal amount plus accrued and unpaid interest						101.00%			101.00%
Debt issuance costs						5,200,000
Portion of the net proceeds from the offering to be funded																								186,300,000	186,300,000
Debt instrument, redemption price														100.00%
Percent redeemable													35.00%
Redemption price percentage of senior note													107.75%
Minimum amount outstanding after redemption													65.00%
Maximum period for redemption on senior note (in days)													90 days
Line of credit facility, current borrowing capacity																			225,000,000				165,000,000
Line of credit facility, maximum increase in borrowing capacity																		250,000,000				225,000,000
Increase in total credit															100,000,000
Marginal interest rate																2.25%	3.25%			1.50%	2.50%
Commitment fee															0.50%
Minimum consolidated interest coverage ratio floor															2.50
Maximum consolidated leverage ratio ceiling															4.00
Maximum consolidated senior secured leverage ratio															2.00
Minimum Debt service coverage ratio			1.05
Borrowings outstanding															0
Letters of credit outstanding under the Credit Agreement															22,500,000
Total Available Credit under the agreement															227,500,000
Termination of revolving credit facility												30,000,000
Wrote off unamortized debt issuance costs		3,900,000								3,900,000
Debt instrument, unamortized discount												9,200,000
Premium paid												36,200,000
Number of subsidiaries						3
Amount of assets held by subsidiaries						$ 0