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Income Taxes (Operating Loss Carryforwards - Textual) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Operating Loss Carryforwards [Line Items]  
Undistributed earnings of foreign subsidiary $ 0.0
Federal [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforwards $ 320.0
Operating loss carryforwards, begin to expire Dec. 31, 2018
California [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforwards $ 329.0
Outstanding awards [Member] | Federal [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforwards 49.1
Outstanding awards [Member] | California [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforwards 34.2
2016 expiration [Member] | California [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforwards $ 13.1
Operating loss carryforwards, begin to expire Dec. 31, 2016
2017 expiration [Member] | California [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforwards $ 10.4
Operating loss carryforwards, begin to expire Dec. 31, 2017
2028 and beyond expiration [Member] | California [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforwards $ 302.0
Operating loss carryforwards, begin to expire Dec. 31, 2028