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Employee Benefit Plans - Narrative (Details) $ in Millions	3 Months Ended
Employee Benefit Plans - Narrative (Details) $ in Millions	Mar. 31, 2017 USD ($) plan
SERPs
Defined Benefit Plan Disclosure [Line Items]
Number of non-qualified defined benefit plan \| plan	2
Contributions to benefit plan	$ 0.2
Estimated future contributions	$ 1.4
Defined benefit plans
Defined Benefit Plan Disclosure [Line Items]
Number of non-qualified defined benefit plan \| plan	2
Contributions to benefit plan	$ 1.1
Estimated future contributions	$ 16.4