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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, 2014   $ 79 $ 541,589 $ 339,400 $ 1,705
Balance, shares at Dec. 31, 2014   79,503,552      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of additional shares pursuant to various stock plans   $ 1 (22)    
Issuance of additional shares pursuant to various stock plans, shares   46,851      
Tax effect of stock plans     46    
Stock-based compensation     628    
Issuance of share in exchange for Foster common stock     (1,150)    
Cash dividends declared on common stock       (15,907)  
Comprehensive income:          
Net income $ 44,299     44,299  
Other comprehensive income (loss)         (2,080)
Balance at Jun. 30, 2015   $ 80 541,091 367,792 (375)
Balance, shares at Jun. 30, 2015   79,550,403.000      
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     (6)    
Issuance of additional shares pursuant to various stock plans, shares   40,465      
Stock-based compensation     98    
Cash dividends declared on common stock       (26,266)  
Comprehensive income:          
Net income 47,013     47,013  
Other comprehensive income (loss)         12,806
Balance at Jun. 30, 2016 $ 971,740 $ 80 $ 541,688 $ 418,998 $ 10,974
Balance, shares at Jun. 30, 2016   79,606,821.000