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Lease Obligations - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
center
Jan. 01, 2019
center
Operating Leased Assets [Line Items]        
Finance lease assets, number of units, centers | center     2 2
Finance lease, right-of-use asset     $ 8.9  
Capital lease assets $ 15.7      
Capital lease, accumulated depreciation 14.1      
Operating leases, rental expense 3.1 $ 2.9    
Future minimum revenues under subleases $ 22.8 $ 27.1    
Minimum [Member]        
Operating Leased Assets [Line Items]        
Lessee, operating lease, renewal term     5 years  
Maximum [Member]        
Operating Leased Assets [Line Items]        
Lessee, operating lease, renewal term     20 years  
Lease term     10 years  
Lease renewal term     5 years