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(Narratives)(Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Tax Disclosure [Abstract] |  |  |
U.S. federal statutory tax rate | 35.00% | 35.00% | 34.00%
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance | $ 900,000 | $ 700,000 |
Accumulated net earning | 61,687,000 | 19,034,000 |
Gross deferred tax assets | 17,700,000 | 14,400,000 |
Gross deferred tax liabilities | 30,500,000 | 19,900,000 |
Income tax benefit for stock-based compensation arrangements | 22,800,000 | 7,500,000 |
Uncertain tax positions | 400,000 | 300,000 |
Internal Revenue Service (IRS) [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 0 |  |
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 9,500,000 |  |
Foreign Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 3,100,000 |  |
Accumulated net earning | $ 13,000,000 |  |

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