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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
Shares Purchased to Fund Options Exercised [Member]
Treasury Stock [Member]
Shares Purchased to Fund Options Exercised [Member]
Restricted Stock Awards Repurchased to Satisfy Tax Obligations [Member]
Treasury Stock [Member]
Restricted Stock Awards Repurchased to Satisfy Tax Obligations [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
AOCI Attributable to Parent [Member]
Total
Balance at Dec. 31, 2014         $ 315,000 $ 206,437,000 $ 289,623,000 $ (37,221,000) $ (2,907,000) $ 456,247,000
Net Income             34,575,000     34,575,000
Award of common shares released from Employee Benefit Trust           2,031,000       2,031,000
Vesting of restricted stock unit award           (3,076,000) (504,000) 3,580,000    
Exercise of stock options           (51,000) (179,000) 372,000   142,000
Stock-based compensation expense           4,128,000       4,128,000
Stock-based income tax benefit           467,000       467,000
Purchase of treasury shares $ (14,351,000) $ (14,351,000) $ (1,253,000) $ (1,253,000)            
Dividends on common stock             (13,999,000)     (13,999,000)
Other comprehensive income                 3,203,000 3,203,000
Balance at Sep. 30, 2015         315,000 209,936,000 309,516,000 (48,873,000) 296,000 471,190,000
Balance at Dec. 31, 2015         315,000 210,652,000 316,530,000 (48,868,000) (5,562,000) 473,067,000
Net Income             50,630,000     50,630,000
Award of common shares released from Employee Benefit Trust           1,984,000       1,984,000
Vesting of restricted stock unit award           (4,049,000) (397,000) 4,446,000    
Exercise of stock options           15,000 (34,000) 151,000   132,000
Stock-based compensation expense           4,416,000       4,416,000
Stock-based income tax benefit           470,000       470,000
Purchase of treasury shares $ (7,492,000) $ (7,492,000) $ (1,610,000) $ (1,610,000)            
Dividends on common stock             (14,787,000)     (14,787,000)
Other comprehensive income                 5,811,000 5,811,000
Balance at Sep. 30, 2016         $ 315,000 $ 213,488,000 $ 351,942,000 $ (53,373,000) $ 249,000 $ 512,621,000