Discontinued Operations - Additional Information (Details) - Medicare Part D - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain from sale of discontinued operations	$ 1,779	$ 0	$ 0
Gain from sale of discontinued operations, net of tax	1,200
Write-off of deferred acquisition costs	16,400
Contingent sale price consideration	$ 3,600