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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 |  |  |  |  |  |  |

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