Long-Term Debt (Narrative) (Details) (USD $)	12 Months Ended						0 Months Ended	12 Months Ended					3 Months Ended	0 Months Ended		12 Months Ended	1 Months Ended			0 Months Ended	12 Months Ended	1 Months Ended			12 Months Ended
	Dec. 31, 2013 item	Dec. 31, 2012	Dec. 31, 2011	Apr. 05, 2012	Jul. 15, 2011	Feb. 28, 2011	Jul. 08, 2011 Maverick Companies	Dec. 31, 2011 Maverick Companies	Dec. 31, 2013 Alternate Base Rate Loans Minimum [Member]	Dec. 31, 2013 Alternate Base Rate Loans Maximum [Member]	Dec. 31, 2013 Eurodollar Loans Minimum [Member]	Dec. 31, 2013 Eurodollar Loans Maximum [Member]	Dec. 31, 2012 7.125% Senior Notes [Member]	Jun. 13, 2011 7.75% Senior Notes due 2019 [Member]	Feb. 15, 2011 7.75% Senior Notes due 2019 [Member]	Dec. 31, 2013 7.75% Senior Notes due 2019 [Member]	Jul. 31, 2011 7.75% Senior Notes due 2019 [Member] Maverick Companies	Feb. 15, 2011 7.75% Senior Notes Due 2019 on and after February 15 2015	Feb. 15, 2011 7.75% Senior Notes Due 2019 Prior To February 15 2014	Oct. 16, 2012 7.75% Senior Notes Due 2022	Dec. 31, 2013 7.75% Senior Notes Due 2022	Feb. 28, 2011 11.625% Senior Notes Due 2014	Dec. 31, 2013 11.625% Senior Notes Due 2014	Oct. 31, 2012 7.125% Senior Notes Due 2016	Dec. 31, 2013 March 31, 2014 and June 30, 2014 [Member]	Dec. 31, 2013 September 30, 2013 and December 31, 2013 [Member]	Dec. 31, 2013 September 30, 2013 through June 30, 2014 [Member]	Dec. 31, 2013 September 30, 2014 and each fiscal quarter thereafter [Member]
Debt Instrument [Line Items]
Issuance of senior notes														$ 200,000,000	$ 275,000,000	$ 464,600,000				$ 293,300,000
Interest rate															7.75%	7.75%				7.75%			11.625%
Debt Instrument, Maturity Date																Feb. 15, 2019					Oct. 15, 2022
Senior notes, aggregate principal amount																475,000,000				300,000,000
Debt instrument, purchase price as a percentage of principal amount														101.00%	100.00%
Total Cash Paid (net of cash acquired)	21,467,000	84,966,000	216,412,000				186,300,000	186,251,000									186,300,000
Debt instrument, redemption price																100.00%					100.00%
Percent redeemable																35.00%					35.00%
Redemption price percentage of senior note																107.75%					107.75%
Minimum amount outstanding after redemption																65.00%					65.00%
Maximum period for redemption on senior note (in days)																90 days					90 days
Debt instrument, repurchase price, percentage on principal amount plus accrued and unpaid interest																101.00%					101.00%
Secured revolving credit facility																		165,000,000	30,000,000
Line of credit facility, current borrowing capacity				250,000,000	225,000,000
Increase in total credit	100,000,000
Marginal interest rate									1.50%	2.50%	2.50%	3.50%
Commitment fee	0.50%
Minimum consolidated interest coverage ratio floor	2.50
Maximum consolidated leverage ratio ceiling																									4.25	4.50		4.00
Maximum consolidated senior secured leverage ratio																											1.75	2.00
Letters of credit outstanding under the Credit Agreement	37,700,000
Total Available Credit under the agreement	212,300,000
Minimum Debt service coverage ratio	1.05
Wrote off unamortized debt issuance costs													1,800,000									3,900,000
Debt instrument, unamortized discount																						9,200,000
Premium paid																						36,200,000		6,100,000
Termination of revolving credit facility						$ 30,000,000