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Employee Benefits - Summary of SERP's and Defined Benefit Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee Benefits      
Balances in Deferred Compensation Plan $ 16,000 $ 13,500  
Value of assets for funding future payouts under the deferred compensation plan 15,300    
Change in plan assets      
Fair value of plan assets at beginning of year 72,400    
Fair value of plan assets at end of year 70,200 72,400  
Amounts recognized in the statement of financial position      
Noncurrent liabilities (103,800) (102,200)  
Supplemental Executive Retirement Plans      
Change in benefit obligation      
Benefit obligation at beginning of year 45,900 38,700  
Service cost 1,000 900 $ 900
Interest cost 1,300 1,500  
Actuarial (gain) loss 2,500 6,100  
Benefits paid (1,300) (1,300)  
Benefit obligation at end of year 49,400 45,900 38,700
Funded status      
Funded status of the plans (49,400) (45,900)  
Items not yet recognized as component of net periodic pension expense      
Unrecognized net actuarial losses 15,300 14,300  
Unamortized prior service (credit) cost   (300)  
Accumulated other comprehensive (income) loss 15,300 14,000  
Amounts recognized in the statement of financial position      
Current liabilities (4,400) (4,000)  
Noncurrent liabilities (45,000) (41,900)  
Accumulated other comprehensive (income) loss 15,300 14,000  
Net amount recognized (34,100) (31,900)  
Accumulated benefit obligation 44,700 44,600  
Components of net periodic benefit cost      
Service cost 1,000 900 900
Interest cost 1,300 1,500 1,500
Prior service (credit) cost (300) (500) (500)
Amortization of net loss 1,500 700 1,300
Net periodic benefit cost $ 3,500 $ 2,600 $ 3,200
Weighted average assumptions to determine net cost      
Discount rate (as a percent) 3.02% 4.07% 3.73%
Rate of compensation increase (as a percent) 6.00% 6.00% 6.00%
Weighted average assumptions to determine benefit obligations      
Discount rate (as a percent) 3.42% 2.94%  
Rate of compensation increase (as a percent) 6.00% 6.00%  
Expected employer contributions during 2016 $ 4,400    
Defined Benefit Plans      
Change in benefit obligation      
Benefit obligation at beginning of year 100,500 $ 82,000  
Service cost 1,700 1,300 $ 1,400
Interest cost 3,700 3,800  
Actuarial (gain) loss (7,400) 17,500  
Benefits paid (3,400) (4,500)  
Plan amendments 1,200 400  
Benefit obligation at end of year 96,300 100,500 82,000
Change in plan assets      
Fair value of plan assets at beginning of year 72,400 70,200  
Actual return on plan assets (600) 3,300  
Employer contributions 1,800 3,300  
Benefits paid (3,400) (4,400)  
Fair value of plan assets at end of year 70,200 72,400 70,200
Funded status      
Funded status of the plans (26,100) (28,100)  
Items not yet recognized as component of net periodic pension expense      
Unrecognized net actuarial losses 25,800 29,500  
Unamortized prior service (credit) cost 2,700 1,700  
Accumulated other comprehensive (income) loss 28,500 31,200  
Amounts recognized in the statement of financial position      
Noncurrent liabilities (26,100) (28,100)  
Accumulated other comprehensive (income) loss 28,500 31,200  
Net amount recognized 2,400 3,100  
Accumulated benefit obligation 96,300 100,500  
Information for defined benefit plans with an accumulated benefit obligation and projected benefit obligation in excess of plan assets      
Accumulated benefit obligation 96,300 100,500  
Projected benefit obligation 96,300 100,500  
Fair value of plan assets 70,200 72,400  
Components of net periodic benefit cost      
Service cost 1,700 1,300 1,400
Interest cost 3,700 3,800 3,400
Expected return on plan assets (5,000) (5,100) (4,400)
Prior service (credit) cost 200 200 200
Amortization of net loss 1,800 400 1,800
Net periodic benefit cost $ 2,400 $ 600 $ 2,400
Weighted average assumptions to determine net cost      
Discount rate (as a percent) 3.87% 4.70% 4.00%
Expected long-term rate of return on plan assets (as a percent) 6.59% 7.22% 7.30%
Weighted average assumptions to determine benefit obligations      
Discount rate (as a percent) 4.13% 3.78%  
Expected long-term rate of return on plan assets (as a percent) 6.59% 7.22%  
Expected employer contributions during 2016 $ 2,100