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Income Tax Other information (Details) (USD $)
 3 Months Ended 12 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax (Textual) [Abstract]          
Income taxes paid     $ 200,000 $ 200,000 $ 2,600,000
Income tax refunds received     700,000 3,400,000 3,300,000
Increase in deferred tax asset valuation allowance 33,500,000   1,600,000 33,300,000  
Operating Loss Carryforwards [Line Items]          
Tax Adjustments, Settlements, and Unusual Provisions   1,300,000 400,000 0 (1,200,000)
Document Fiscal Year Focus     2013    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]          
Balance at beginning of year   2,096,000 2,096,000   92,000
Additions for tax positions of current year     585,000 1,261,000  
Additions for tax positions of prior years     114,000 835,000  
Reductions for tax positions of prior years     0 (92,000)  
Balance at end of year     2,795,000 2,096,000  
State
          
Operating Loss Carryforwards [Line Items]          
Net operating loss carryforwards       44,900,000  
Foreign
          
Operating Loss Carryforwards [Line Items]          
Tax credit carryforwards       500,000  
US Federal
          
Operating Loss Carryforwards [Line Items]          
Net operating loss carryforwards       $ 46,500,000