PARENT COMPANY INFORMATION (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Assets
Cash and cash equivalents	$ 227,441	$ 245,879	$ 313,875	$ 342,379
Investments in subsidiaries, equity basis	26,743	28,997
Other assets	203,196	198,669
TOTAL ASSETS	1,180,061	1,190,549
LIABILITIES
Long-term obligations	250,000	250,000
Other liabilities	83,574	97,563
Total Liabilities	754,005	741,637
STOCKHOLDERS' EQUITY
Preferred stock, $0.01 par value; 5,000,000 shares authorized, none outstanding at December 31, 2012 and 2011
Common stock, $0.01 par value; 400,000,000 shares authorized and 134,689,148 and 131,669,676 shares issued at December 31, 2012 and 2011, respectively	1,347	1,317
Additional paid in capital	374,798	365,835
Retained earnings	121,415	160,934
Treasury stock, 17,313,686 and 14,145,038 common shares at cost at December 31, 2012 and 2011, respectively	(75,020)	(73,919)
Accumulated other comprehensive income (loss)	2,542	(6,955)
Total Stockholders' Equity	425,082	447,212
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,180,061	1,190,549
Stockholders' equity, other disclosure
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	134,689,148	131,669,676
Treasury stock, common shares at cost	17,313,686	14,145,038
Parent Company
Assets
Cash and cash equivalents	216	127	752	8,153
Investments in subsidiaries, equity basis	453,186	414,021
Advances to subsidiaries	189,189	258,951	302,079
Other assets	37,758	33,857
TOTAL ASSETS	680,349	706,956
LIABILITIES
Long-term obligations	250,000	250,000
Other liabilities	5,267	9,744
Total Liabilities	255,267	259,744
STOCKHOLDERS' EQUITY
Common stock, $0.01 par value; 400,000,000 shares authorized and 134,689,148 and 131,669,676 shares issued at December 31, 2012 and 2011, respectively	1,347	1,317
Additional paid in capital	374,798	365,835
Retained earnings	121,415	160,934
Treasury stock, 17,313,686 and 14,145,038 common shares at cost at December 31, 2012 and 2011, respectively	(75,020)	(73,919)
Accumulated other comprehensive income (loss)	2,542	(6,955)
Total Stockholders' Equity	425,082	447,212
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 680,349	$ 706,956
Stockholders' equity, other disclosure
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	134,689,148	131,669,676
Treasury stock, common shares at cost	17,313,686	14,145,038
Maximum notice period of termination of guarantees	30 days