Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands	Total	Common Stock Member	Additional Paid In Capital Member	Retained Earnings Member	Accumulated Other Comprehensive Income Member	Noncontrolling Interest Member
Balance at Dec. 31, 2010	$ 901,478	$ 468	$ 242,390	$ (58,298)	$ (145)	$ 717,063
Balance (Share) at Dec. 31, 2010		46,894
Adjustment to additional paid in capital	(522)	0	(522)	0	0	0
Stock-based compensation	5,688	0	2,517	0	0	3,171
Common dividends	(13,025)	0	0	(13,025)	0	0
Net income (loss)	(144)	0	0	(4,198)	0	4,054
Conversion of restricted stock, net of shares withheld for taxes	(1,066)	3	(1,069)	0	0	0
Conversion of restricted stock, net of shares withheld for taxes (Shares)		299
Hedging gains or losses reclassified to earnings	1,360	0	0	0	254	1,106
Adjustment in fair value of derivatives	(1,083)	0	0	0	(202)	(881)
Non-controlling partner's impact of conversion of restricted units and options exercise	(1,285)	0	0	0	0	(1,285)
Distribution to non-controlling interest	(42,753)	0	0	0	0	(42,753)
Balance at Sep. 30, 2011	$ 848,648	$ 471	$ 243,316	$ (75,521)	$ (93)	$ 680,475
Balance (Share) at Sep. 30, 2011		47,193