Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Defecit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2012	$ 950,240	$ 473	$ 274,635	$ (117,583)	$ 141	$ 792,574
Balance (Share) at Dec. 31, 2012		47,414
Issuance of common units by the Partnership to non-controlling interest	362,778					362,778
Stock-based compensation	8,137		4,058			4,079
Common dividends	(11,748)			(11,748)
Net income (loss)	(16,515)			(7,603)		(8,912)
Conversion of restricted stock for common, net of shares withheld for taxes (Shares)		201
Adjustments Related to Tax Withholding for Share-based Compensation	(1,196)	2	(1,198)
Hedging gains or losses reclassified to earnings	(458)				(55)	(403)
Adjustment in fair value of derivatives	943				109	834
Non-controlling partner's impact of conversion of restricted units and options exercise	(643)					(643)
Changes in equity due to issuance of units by the Partnership	(3,165)		21,072		(56)	(24,181)
Contribution from non-controlling interest in Subsidiary	(41,856)		0			(41,856)
Contribution From Non-Controlling Interest In Subsidiary	5,217					5,217
Balance at Jun. 30, 2013	$ 1,251,734	$ 475	$ 298,567	$ (136,934)	$ 139	$ 1,089,487
Balance (Share) at Jun. 30, 2013		47,615