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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2009 | $ 1,102,698 | $ 470 | $ 541,453 | $ 608,314 | $ (47,539)
Beginning Balance (in shares) at Dec. 31, 2009 |  | 46,985,000 |  |  |
Net income (loss) | 65,984 |  |  | 65,984 |
Other comprehensive income (loss): |  |  |  |  |
Cumulative translation adjustment | (5,951) |  |  |  | (5,951)
Issuance of common stock in connection with: |  |  |  |  |
Exercise of options, net of income tax expense from share-based awards of $994 in 2012, $846 in 2011 and $227 in 2010 (in shares) |  | 408,000 |  |  |
Exercise of options, net of income tax expense from share-based awards of $994 in 2012, $846 in 2011 and $227 in 2010 | 10,516 | 4 | 10,512 |  |
Restricted share grants, less net settled shares of 178 in 2012, 119 in 2011 and 106 in 2010 (in shares) |  | 510,000 |  |  |
Restricted share grants, less net settled shares of 178 in 2012, 119 in 2011 and 106 in 2010 | (4,094) | 5 | (4,099) |  |
Stock units issued under incentive compensation plan | 6,531 |  | 6,531 |  |
Business combinations | (2,931) |  | (2,931) |  |
Purchase and retirement of common stock (in shares) | (1,178,089) | (1,759,000) |  |  |
Purchase and retirement of common stock | (40,634) | (18) | (40,616) |  |
Share-based compensation | 35,487 |  | 35,487 |  |
Ending Balance at Dec. 31, 2010 | 1,167,606 | 461 | 546,337 | 674,298 | (53,490)
Ending Balance (in shares) at Dec. 31, 2010 |  | 46,144,000 |  |  |
Net income (loss) | 103,903 |  |  | 103,903 |
Other comprehensive income (loss): |  |  |  |  |
Cumulative translation adjustment | (2,902) |  |  |  | (2,902)
Issuance of common stock in connection with: |  |  |  |  |
Exercise of options, net of income tax expense from share-based awards of $994 in 2012, $846 in 2011 and $227 in 2010 (in shares) |  | 637,000 |  |  |
Exercise of options, net of income tax expense from share-based awards of $994 in 2012, $846 in 2011 and $227 in 2010 | 16,423 | 7 | 16,416 |  |
Restricted share grants, less net settled shares of 178 in 2012, 119 in 2011 and 106 in 2010 (in shares) |  | 436,000 |  |  |
Restricted share grants, less net settled shares of 178 in 2012, 119 in 2011 and 106 in 2010 | (4,466) | 4 | (4,470) |  |
Stock units issued under incentive compensation plan | 4,241 |  | 4,241 |  |
Business combinations | (5,455) |  | (5,455) |  |
Purchase and retirement of common stock (in shares) | (5,733,205) | (5,733,000) |  |  |
Purchase and retirement of common stock | (209,400) | (57) | (209,343) |  |
Share-based compensation | 36,252 |  | 36,252 |  |
Ending Balance at Dec. 31, 2011 | 1,106,202 | 415 | 383,978 | 778,201 | (56,392)
Ending Balance (in shares) at Dec. 31, 2011 | 41,484,000 | 41,484,000 |  |  |
Net income (loss) | (36,986) |  |  | (36,986) |
Other comprehensive income (loss): |  |  |  |  |
Cumulative translation adjustment | 15,023 |  |  |  | 15,023
Issuance of common stock in connection with: |  |  |  |  |
Exercise of options, net of income tax expense from share-based awards of $994 in 2012, $846 in 2011 and $227 in 2010 (in shares) | 329,000 | 328,000 |  |  |
Exercise of options, net of income tax expense from share-based awards of $994 in 2012, $846 in 2011 and $227 in 2010 | 7,043 | 4 | 7,039 |  |
Restricted share grants, less net settled shares of 178 in 2012, 119 in 2011 and 106 in 2010 (in shares) |  | 443,000 |  |  |
Restricted share grants, less net settled shares of 178 in 2012, 119 in 2011 and 106 in 2010 | (6,385) | 4 | (6,389) |  |
Stock units issued under incentive compensation plan | 3,079 |  | 3,079 |  |
Business combinations | 1,035 | 2 | 1,033 |  |
Business combinations (in shares) |  | 181,000 |  |  |
Reacquisition of equity component of convertible debt | (108) |  | (108) |  |
Purchase and retirement of common stock (in shares) |  | (1,681,000) |  |  |
Purchase and retirement of common stock | (50,032) | (17) | (50,015) |  |
Share-based compensation | 29,361 |  | 29,361 |  |
Ending Balance at Dec. 31, 2012 | $ 1,068,232 | $ 408 | $ 367,978 | $ 741,215 | $ (41,369)
Ending Balance (in shares) at Dec. 31, 2012 | 40,755,000 | 40,755,000 |  |  |

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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration