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Insurance Risk Programs	12 Months Ended
Insurance Risk Programs	Dec. 31, 2017
Insurance [Abstract]
Insurance Risk Programs	Insurance Risk Programs Under a number of the Company’s insurance programs, which include the Company’s employee health insurance, workers’ compensation, and professional malpractice liability insurance programs, the Company is liable for a portion of its losses before it can attempt to recover from the applicable insurance carrier. The Company accrues for losses for which it will be ultimately responsible under an occurrence-based approach whereby the Company estimates the losses that will be incurred in a respective accounting period and accrues that estimated liability using actuarial methods. Provisions for losses for professional liability risks retained by the Company at December 31, 2016 and 2017 have been discounted at 3%. The Company recorded a liability of $147.4 million and $157.1 million related to these programs at December 31, 2016 and 2017, respectively. If the Company did not discount the provisions for losses for professional liability risks, the aggregate liability for all of the insurance risk programs would be approximately $152.7 million and $162.1 million at December 31, 2016 and 2017, respectively.