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 (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	185,528	0	0	0	0	185,528
Stock-based compensation	5,106	0	2,525	0	0	2,581
Common dividends	(5,846)	0	0	(5,846)	0	0
Net loss	(5,104)	0	0	(2,936)	0	(2,168)
Conversion of restricted stock for common, net of shares withheld for taxes	(1,196)	2	(1,198)	0	0	0
Conversion of restricted stock for common, net of shares withheld for taxes (Shares)		186
Hedging gains or losses reclassified to earnings	241	0	0	0	(30)	(211)
Adjustment in fair value of derivatives	123	0	0	0	15	108
Non-controlling partner's impact of conversion of restricted units and options exercise	(890)	0	0	0	0	(890)
Distributions to non-controlling interest	20,652	0	0	0	0	20,652
Changes in equity due to issuance of units by the Partnership	2,528	0	11,403	0	(53)	(8,822)
Non-controlling interest contribution	(3,439)	0	1,164	0	0	(4,603)
Balance at Mar. 31, 2013	$ 1,113,035	$ 475	$ 286,201	$ (126,365)	$ 73	$ 952,651
Balance (Share) at Mar. 31, 2013		47,600