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Restructuring - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 4,180			$ 6,170	$ 4,180
Pre-tax restructuring expenses related to restructuring initiative				12,083	8,455	$ 3,674
Restructuring liabilities	4,180		$ 3,893	6,170	$ 4,180	$ 3,893
2018 Incentive
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses related to restructuring initiative				$ 12,083
2017 Initiative
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses related to restructuring initiative	$ 3,658
2016 Initiative
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses related to restructuring initiative		$ 4,797	$ 3,674