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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] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Income [Member] | Non-Controlling Interests [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 40,297 | $ 1,066 | $ 874,753 | $ (822,625) | $ (22,344) | $ 9,447
Balance (in shares) at Dec. 31, 2011 |  | 106,573,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 53,832 |  |  | 49,999 |  | 3,833
Foreign currency translation adjustment | 3,149 |  |  |  | 3,149 |
Stock-based compensation, value | 833 |  | 833 |  |  |
Repurchase of common stock, shares |  | (36,000) |  |  |  |
Repurchase of common stock, value | (116) | (1) | 316 | (431) |  |
Forfeiture of restricted stock, shares |  | (20,000) |  |  |  |
Forfeiture of restricted stock, value | (127) |  | (127) |  |  |
Issuance of notes receivable due from stockholders | (47) |  | (47) |  |  |
Repayments of notes receivable due from stockholders | 1,463 |  | 1,463 |  |  |
Distributions to noncontrolling interests | (4,160) |  |  |  |  | (4,160)
Balance at Mar. 31, 2012 | 95,124 | 1,065 | 877,191 | (773,057) | (19,195) | 9,120
Balance (in shares) at Mar. 31, 2012 |  | 106,517,000 |  |  |  |
Balance at Dec. 31, 2012 | 220,205 | 1,211 | 1,000,963 | (773,085) | (14,801) | 5,917
Balance (in shares) at Dec. 31, 2012 | 121,148,451 | 121,148,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 65,056 |  |  | 63,223 |  | 1,833
Foreign currency translation adjustment | (4,532) |  |  |  | (4,532) |
Stock-based compensation, value | 4,494 |  | 4,494 |  |  |
Exercise of stock options, shares |  | 1,212,000 |  |  |  |
Exercise of stock options, common stock value | 10,639 | 12 | 10,627 |  |  |
Issuance of restricted stock, shares |  | 219,000 |  |  |  |
Issuance of restricted stock, value | 3 | 3 | 0 |  |  |
Forfeiture of restricted stock, shares |  | (10,000) |  |  |  |
Forfeiture of restricted stock, value | (3) |  | (3) |  |  |
Repayments of notes receivable due from stockholders | 5,312 |  | 5,312 |  |  |
Distributions to noncontrolling interests | (2,435) |  |  |  |  | (2,435)
Balance at Mar. 31, 2013 | $ 298,739 | $ 1,226 | $ 1,021,393 | $ (709,862) | $ (19,333) | $ 5,315
Balance (in shares) at Mar. 31, 2013 | 122,569,475 | 122,569,000 |  |  |  |

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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