Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Balance, at Dec. 31, 2010	$ 901,478	$ 468	$ 242,390	$ (58,298)	$ (145)	$ 717,063
Balance, Shares at Dec. 31, 2010		46,894,000
Conversion of restricted stock for common, net of shares withheld for taxes, value	1,068	3	1,071	0	0	0
Conversion of restricted stock for common, net of shares withheld for taxes, Shares		300,000
Change in equity due to issuance of units by the Partnership	(476)	0	(476)	0	0	0
Stock-based Compensation	7,556	0	3,368	0	0	4,188
Common dividends	(17,872)	0	0	(17,872)	0	0
Net loss	(1,279)	0	0	(6,007)	0	4,728
Hedging gains or losses reclassified to earnings	1,769	0	0	0	330	1,439
Adjustment in fair value of derivatives	(1,446)	0	0	0	(270)	(1,176)
Non Controlling Partners Impact Of Conversion Of Restricted Units and Option Exercises	(1,206)	0	0	0	0	(1,206)
Distribution to non-controlling interest	(58,209)	0	0	0	0	(58,209)
Balance, at Dec. 31, 2011	829,247	471	244,211	(82,177)	(85)	666,827
Balance, Shares at Dec. 31, 2011		47,194,000
Issuance of units by the Partnership to non-controlling interest, Shares		0
Issuance of units by the Partnership to non-controlling interest, Value	232,791	0	0	0	0	232,791
Conversion of restricted stock for common, net of shares withheld for taxes, value	794	2	796	0	0	0
Conversion of restricted stock for common, net of shares withheld for taxes, Shares		220,000
Change in equity due to issuance of units by the Partnership	8,610	0	24,500	0	0	(15,890)
Stock-based Compensation	9,483	0	4,481	0	0	5,002
Common dividends	(22,925)	0	0	(22,925)	0	0
Net loss	(36,740)	0	0	(12,481)	0	(24,259)
Hedging gains or losses reclassified to earnings	(641)	0	0	0	(81)	(560)
Adjustment in fair value of derivatives	1,642	0	0	0	307	1,335
Non Controlling Partners Impact Of Conversion Of Restricted Units and Option Exercises	(594)	0	0	0	0	(594)
Distribution to non-controlling interest	(69,839)	0	0	0	0	(69,839)
Purchase of non-controlling interest	0	0	2,239	0	0	(2,239)
Balance, at Dec. 31, 2012	950,240	473	274,635	(117,583)	141	792,574
Balance, Shares at Dec. 31, 2012		47,414,000
Issuance of units by the Partnership to non-controlling interest, Shares		0
Issuance of units by the Partnership to non-controlling interest, Value	419,498	0	0	0	0	419,498
Conversion of restricted stock for common, net of shares withheld for taxes, value	2,087	3	2,090	0	0	0
Conversion of restricted stock for common, net of shares withheld for taxes, Shares		321,000
Change in equity due to issuance of units by the Partnership	(7,224)	0	27,959	0	(60)	(35,123)
Stock-based Compensation	14,383	0	7,185	0	0	7,198
Common dividends	(24,044)	0	0	(24,044)	0
Net loss	(112,635)	0	0	(29,636)	0	(82,999)
Hedging gains or losses reclassified to earnings	(1,002)	0	0	0	(116)	(886)
Adjustment in fair value of derivatives	(234)	0	0	0	(23)	(211)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		22,000
Partners' Capital Account, Option Exercise	146	0	146	0	0	0
Non Controlling Partners Impact Of Conversion Of Restricted Units and Option Exercises	(1,093)	0	0	0	0	(1,093)
Distribution to non-controlling interest	(91,497)	0	0	0	0	(91,497)
Contribution from non-controlling interest in subsidiary	9,065	0	0	0	0	9,065
Balance, at Dec. 31, 2013	$ 1,153,516	$ 476	$ 307,835	$ (171,263)	$ (58)	$ 1,016,526
Balance, Shares at Dec. 31, 2013		47,757,000