CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Shares Outstanding	Common Stock	Surplus	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Non- Controlling Interests
Balance at Dec. 31, 2013	$ 660,174		$ 784,547	$ 75,498	$ (184,087)	$ (15,845)	$ 61
Balance (in shares) at Dec. 31, 2013		42,107,633
Increase (Decrease) in Shareholders' Equity
Net income	27,188				27,188
Other comprehensive income	18,810					18,810
Cash dividends	(9,841)				(9,841)
Net shares of common stock sold by directors' deferred compensation plan	(11)		(11)
Shares of common stock repurchased and other related costs	$ (129,391)		(129,391)
Shares of common stock repurchased and other related costs (in shares)	(6,369,266)	(6,369,266)
Share-based compensation	$ 2,174		74	2,100
Share-based compensation (in shares)		164,863
Non-controlling interests	(61)						(61)
Balance at Sep. 30, 2014	569,042		655,219	77,598	(166,740)	2,965
Balance (in shares) at Sep. 30, 2014		35,903,230
Balance at Dec. 31, 2013	660,174		$ 784,547	75,498	(184,087)	(15,845)	$ 61
Balance (in shares) at Dec. 31, 2013		42,107,633
Increase (Decrease) in Shareholders' Equity
Shares of common stock repurchased and other related costs (in shares)			(857,554)
Balance at Dec. 31, 2014	$ 568,041		$ 642,205	79,716	(157,039)	3,159
Balance (in shares) at Dec. 31, 2014	35,233,674	35,233,674
Increase (Decrease) in Shareholders' Equity
Net income	$ 34,936				34,936
Other comprehensive income	3,877					3,877
Cash dividends	(11,718)				(11,718)
Net shares of common stock sold by directors' deferred compensation plan	(154)		(154)
Shares of common stock repurchased and other related costs	$ (93,533)		(93,533)
Shares of common stock repurchased and other related costs (in shares)	(4,122,881)	(4,122,881)
Share-based compensation	$ 1,812			1,812
Share-based compensation (in shares)		219,851
Balance at Sep. 30, 2015	$ 503,261		$ 548,518	$ 81,528	$ (133,821)	$ 7,036
Balance (in shares) at Sep. 30, 2015	31,330,644	31,330,644