Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Series B Preferred Stock [Member] Preferred Stock [Member]	Series B Preferred Stock [Member] Retained Earnings [Member]	Series B Preferred Stock [Member]	Common Stock [Member] Stock Issued to Directors [Member]	Common Stock [Member] Stock Issued for 401(k) Match [Member]	Common Stock [Member]	Additional Paid-in Capital [Member] Stock Issued to Directors [Member]	Additional Paid-in Capital [Member] Stock Issued for 401(k) Match [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Stock Issued to Directors [Member]	Stock Issued for 401(k) Match [Member]	Total
Balance at Dec. 31, 2012	$ 39					$ 71,499			$ 1,218,283	$ (123,288)	$ (23,918)	$ (4,664)			$ 1,137,951
Net income (loss)										(25,130)					(25,130)
Stock issued to directors				$ 31			$ 356						$ 387
Series B Preferred Stock dividends declared		$ (552)	$ (552)												(552)
Common stock issued for assets purchased						14,249			204,053						218,302
Warrants exercised						6			55						61
Repurchase of common shares												(286)			(286)
Other comprehensive loss											(2,381)				(2,381)
Common stock dividends declared						2			19	(6,012)		(71)			(6,062)
Restricted stock units granted									4,188						4,188
Restricted stock unit distributions						109			(109)			(59)			(59)
Balance at Dec. 31, 2013	39					85,896			1,426,845	(154,982)	(26,299)	(5,080)			1,326,419
Net income (loss)										17,824					17,824
Stock issued to directors				37			438						475
Series B Preferred Stock dividends declared		(552)	(552)												(552)
Stock issued for 401(k) match					$ 203			$ 2,226						$ 2,429
Warrants exercised						5,577			48,841						54,418
Repurchase of common shares												(1,501)			(1,501)
Other comprehensive loss											(5,732)				(5,732)
Common stock dividends declared						4			46	(3,596)					(3,546)
Restricted stock units granted									9,019						9,019
Restricted stock unit distributions						665			(665)			(2,279)			(2,279)
Balance at Dec. 31, 2014	39					92,382			1,486,750	(141,306)	(32,031)	(8,860)			1,396,974
Net income (loss)										(86,968)					(86,968)
Stock issued to directors				$ 59		218	$ 547		2,808				$ 606		3,026
Series B Preferred Stock dividends declared		$ (552)	$ (552)												(552)
Stock issued for 401(k) match					$ 333	441		$ 3,114	4,569					$ 3,447	5,010
Common stock issued for assets purchased						1,562			17,215						18,777
Repurchase of common shares												(940)			(940)
Other comprehensive loss											(600)				(600)
Common stock dividends declared										(3,739)					(3,739)
Restricted stock units granted									4,819						4,819
Restricted stock unit distributions						224			(224)			(934)			(934)
Balance at Dec. 31, 2015	$ 39					$ 95,219			$ 1,519,598	$ (232,565)	$ (32,631)	$ (10,734)			$ 1,338,926