Employee Benefit Plans - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current deferred compensation liability	$ 3,700,000	$ 2,700,000
Deferred compensation plan	27,000,000	27,500,000
Deferred compensation plan assets	28,600,000	27,300,000
Supplemental Executive Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Supplemental executive retirement plan	13,700,000	$ 13,400,000
Employer contributions to benefit plans	0
Expected funding of the SERP in the current year	$ 0