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Consolidated statements of changes in stockholders' equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock [Member]
Additional paid in capital [Member]
Treasury stock [Member]
Warrants [Member]
Retained earnings [Member]
Accumulated other comprehensive income (loss) [Member]
Total common stockholders' equity [Member]
Noncontrolling interest [Member]
Balance at Dec. 31, 2010 $ 463,077 $ 575 $ 341,658 $ (25,823) $ 7,825 $ 150,803 $ (12,515) $ 462,523 $ 554
Balance (in shares) at Dec. 31, 2010   57,540,698              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of common stock 54,111 65 54,046         54,111  
Issuance of common stock (in shares)   6,513,073              
Issuance of stock related to acquisitions 38,955 34 38,921         38,955 0
Issuance of stock related to acquisitions (in shares)   3,418,652              
Issuance of restricted stock (in shares)   66,230              
Restricted stock purchase 1,610 2 1,608 0       1,610  
Restricted stock purchase (in shares)   150,775              
Exercise of stock options 1,300 3 1,297         1,300  
Exercise of stock options (in shares)   263,477              
Stock based compensation expense 5,156   5,156         5,156  
Restricted stock withheld (54)     (54)       (54)  
Restricted stock withheld (in shares)   (12,025)              
Warrant issuance     (19,278)   19,278        
Exercise of warrants 25   31   (6)     25  
Exercise of warrants (in shares)   3,145              
Excess tax benefits 1,027   1,027         1,027  
Change in pension liability 0                
Currency translation adjustment (5,094)           (4,928) (4,928) (166)
Change related to derivative liabilities, net of tax 1,426           1,426 1,426  
Net income 93,593         93,342   93,342 251
Balance at Dec. 31, 2011 655,132 679 424,466 (25,877) 27,097 244,145 (16,017) 654,493 639
Balance (in shares) at Dec. 31, 2011   67,944,025              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of common stock 499   499         499  
Issuance of common stock (in shares)   30,821              
Issuance of stock upon IPO, net of offering costs 256,381 139 256,242         256,381  
Issuance of stock upon IPO, net of offering costs (in shares)   13,889,470              
Issuance of stock upon concurrent private placement 50,000 27 49,973         50,000  
Issuance of stock upon concurrent private placement (in shares)   2,666,666              
Issuance of restricted stock   9 (9)            
Issuance of restricted stock (in shares)   869,826              
Exercise of stock options 10,742 16 10,726         10,742  
Exercise of stock options (in shares)   1,573,268              
Stock based compensation expense 8,179   8,179         8,179  
Exercise of warrants 3,183 3 3,883   (703)     3,183  
Exercise of warrants (in shares)   363,044              
Treasury stock (56)     (56)       (56)  
Excess tax benefits 7,337   7,337 0       7,337  
Equity related to contingent consideration 3,341 2 3,339         3,341  
Equity related to contingent consideration (in shares)   206,053              
Change in pension liability 0                
Currency translation adjustment 15,887           15,917 15,917 (30)
Net income 151,530         151,456   151,456 74
Balance at Dec. 31, 2012 1,162,155 875 764,635 (25,933) 26,394 395,601 (100) 1,161,472 683
Balance (in shares) at Dec. 31, 2012   87,543,173              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of common stock (in shares)         4,227,358        
Issuance of restricted stock (1)   (1)         (1)  
Issuance of restricted stock (in shares)   26,017              
Exercise of stock options 5,458 8 5,450         5,458  
Exercise of stock options (in shares) 900,000 796,848              
Stock based compensation expense 19,039   19,039         19,039  
Exercise of warrants 0 43 25,664   (25,707)     0  
Exercise of warrants (in shares)   4,272,775              
Treasury stock (4,316)     (4,316)       (4,316)  
Excess tax benefits 7,204   7,204         7,204  
Equity related to contingent consideration 4,075 2 4,073   0     4,075  
Equity related to contingent consideration (in shares)   164,576              
Change in pension liability 223           223 223  
Currency translation adjustment 7,525           7,662 7,662 (137)
Net income 129,604         129,539   129,539 65
Balance at Dec. 31, 2013 $ 1,330,966 $ 928 $ 826,064 $ (30,249) $ 687 $ 525,140 $ 7,785 $ 1,330,355 $ 611
Balance (in shares) at Dec. 31, 2013   92,803,389