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Goodwill and Other Intangible Assets - Textuals (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]      
Proceeds from disposal of assets $ 12,300,000 $ 23,900,000 $ 4,000,000
Goodwill impairment loss 0 0 $ 0
Accumulated goodwill impairment $ 0    
Pediatric Home Care Service [Member]      
Goodwill [Line Items]      
Proceeds from disposal of assets   21,000,000  
Gain recorded as part of other operating expenses   $ 3,300,000