Accrued Professional Liabilities (Components of Reserves) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Estimated losses under self-insured programs	$ 34,019	$ 30,748
Incurred but not reported losses	40,038	36,166
Total accrued professional liabilities	74,057	66,914
Less estimated losses payable within one year	15,346	14,362
Total	$ 58,711	$ 52,552