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Consolidated Statements of Stockholders' Equity (USD $) In Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at December 31, 2009 at Dec. 31, 2009 | $ 219 | $ 76,477 | $ 196,480 | $ 1,731 | $ 274,907
Balance at December 31, 2009 (in Shares) at Dec. 31, 2009 | 21,885 |  |  |  |
Net income |  |  | 19,742 |  | 19,742
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards | 1 | 302 |  |  | 303
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) | 65 |  |  |  |
Tax benefits from share-based payment arrangement exercises |  | 385 |  |  | 385
Share-based payment arrangement compensation expense |  | 1,264 |  |  | 1,264
Dividends on common stock |  |  | (877) |  | (877)
Income before income taxes attributable to noncontrolling interest |  |  |  | 631 | 631
Noncontrolling interest distributions |  |  |  | (451) | (451)
Balance at Dec. 31, 2010 | 220 | 78,428 | 215,345 | 1,911 | 295,904
Balance (in Shares) at Dec. 31, 2010 | 21,950 |  |  |  |
Net income |  |  | 24,285 |  | 24,285
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards |  | 137 |  |  | 137
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) | 35 |  |  |  |
Tax benefits from share-based payment arrangement exercises |  | 164 |  |  | 164
Share-based payment arrangement compensation expense |  | 1,349 |  |  | 1,349
Dividends on common stock |  |  | (1,758) |  | (1,758)
Income before income taxes attributable to noncontrolling interest |  |  |  | 807 | 807
Noncontrolling interest distributions |  |  |  | (529) | (529)
Balance at Dec. 31, 2011 | 220 | 80,078 | 237,872 | 2,189 | 320,359
Balance (in Shares) at Dec. 31, 2011 | 21,985 |  |  |  |
Net income |  |  | 27,267 |  | 27,267
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards | 1 | 967 |  |  | 968
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) | 125 |  |  |  |
Tax benefits from share-based payment arrangement exercises |  | 409 |  |  | 409
Share-based payment arrangement compensation expense |  | 1,225 |  |  | 1,225
Dividends on common stock |  |  | (18,679) |  | (18,679)
Income before income taxes attributable to noncontrolling interest |  |  |  | 497 | 497
Noncontrolling interest distributions |  |  |  | (123) | (123)
Balance at Dec. 31, 2012 | $ 221 | $ 82,679 | $ 246,460 | $ 2,563 | $ 331,923
Balance (in Shares) at Dec. 31, 2012 | 22,110 |  |  |  |

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