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Income Tax Other information (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Tax (Textual) [Abstract] |  |  |  |
Income taxes paid |  | $ 200,000 | $ 2,600,000 | $ 5,300,000
Income tax refunds received |  | 3,400,000 | 3,300,000 | 5,800,000
Increase in deferred tax asset valuation allowance | 33,500,000 | 33,300,000 |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss and tax credit carryforwards |  | 65,600,000 |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Balance at beginning of year |  | 92,000 | 0 |
Additions for tax positions of current year |  | 1,261,000 | 92,000 |
Additions for tax positions of prior years |  | 835,000 | 0 |
Reductions for tax positions of prior years |  | (92,000) | 0 |
Settlements |  | 0 | 0 |
Balance at end of year |  | 2,096,000 | 92,000 | 0
State |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards |  | 33,400,000 |  |
Foreign |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforwards |  | 500,000 |  |
US Federal |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards |  | $ 31,700,000 |  |

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