Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Goodwill [Line Items]
Income tax benefit	$ 1,101	$ 35,886	$ 5,778	$ 37,862
Effective income tax rate (as a percent)	20.40%	17.20%	25.50%	17.40%
Statutory income tax rate (as a percent)	35.00%		35.00%
Impairment of goodwill	$ 0	$ 209,938	$ 0	$ 209,938
Goodwill Impairment Loss Effective Tax Benefit Rate			17.50%
Income tax interest or penalties accrued	$ 0		$ 0		$ 0
Customer Interaction [Member]
Goodwill [Line Items]
Impairment of goodwill		209,938		209,900
Income tax benefit, goodwill impairment		$ (36,814)		$ (36,800)