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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 07, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]        
Deferred rent   $ 2.4 $ 3.6  
Total rent expense   19.7 $ 16.0 $ 14.6
Exposure to earthquake loss   $ 60.2    
Litigation Settlement, Expense $ 27.6