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Condensed Consolidated Statements Of Changes In Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital [Member]
Retained earnings
Accumulated other comprehensive income (loss), net
Balance at Dec. 31, 2015 $ 938,095 $ 80 $ 541,596 $ 398,251 $ (1,832)
Balance, shares at Dec. 31, 2015   79,566,356      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of additional shares pursuant to various stock plans 7 7    
Issuance of additional shares pursuant to various stock plans, shares   30,750      
Stock-based compensation 22   22    
Cash dividends declared on common stock (8,752)     (8,752)  
Comprehensive income:          
Net income 23,623     23,623  
Other comprehensive income (loss) 8,987       8,987
Balance at Mar. 31, 2016 961,982 $ 80 541,625 413,122 7,155
Balance, shares at Mar. 31, 2016   79,597,106      
Balance at Dec. 31, 2016 1,855,473 $ 135 1,400,490 469,505 (14,657)
Balance, shares at Dec. 31, 2016   135,240,079      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of additional shares pursuant to various stock plans 252   252    
Issuance of additional shares pursuant to various stock plans, shares   8,106      
Stock-based compensation 533   533    
Cash dividends declared on common stock (16,229)     (16,229)  
Comprehensive income:          
Net income 36,210     36,210  
Other comprehensive income (loss) 1,808       1,808
Balance at Mar. 31, 2017 $ 1,878,047 $ 135 $ 1,401,275 $ 489,486 $ (12,849)
Balance, shares at Mar. 31, 2017   135,248,185