Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Shares issued for exercise of stock option, shares	0
COMMON STOCK (Par Value: $0.01):
Shares issued for restricted stock awards, shares	1,683,564	1,782,601	1,729,950
Shares issued in follow-on common stock offering, shares	40,625,000
(ACCUMULATED DEFICIT) RETAINED EARNINGS:
Dividends paid on common stock, per share	$ 1.00	$ 1.00	$ 1.00
TREASURY STOCK:
Purchase of common stock, shares	448,223	439,437	383,640
Shares issued for exercise of stock option, shares		8,990	20,234
Shares issued for restricted stock awards, shares	495,777	422,097	382,471