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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract] |  |  |
Net Income | $ 77,130 | $ 37,773 | $ 145,420
Other comprehensive income (loss), net of tax: |  |  |
Foreign currency translation adjustment, net of tax of ($50) for the year ended December 31, 2013 | 81 |  |
Unrealized gain (loss) on available-for-sale securities, net of tax of $223 and $81 for the years ended December 31, 2013 and 2012, respectively | 56 | (273) | 294
Other comprehensive income (loss) | 137 | (273) | 294
Comprehensive income | 77,267 | 37,500 | 145,714
Comprehensive income attributable to noncontrolling interests | (1,940) | (101) |
Preferred stockholder dividends |  |  | (9,482)
Allocation of comprehensive income to preferred stockholders |  | (64) | (24,260)
Comprehensive income attributable to common stockholders | $ 75,327 | $ 37,335 | $ 111,972

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