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Employee Benefit Plan (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Components of net periodic benefit cost        
Amortization of amounts previously recognized in accumulated other comprehensive (loss) income     $ 686 $ 637
Contributions to pension plan     1,800 1,300
Pension Benefits        
Components of net periodic benefit cost        
Service cost $ 0 $ 0 0 0
Interest cost 625 618 1,875 1,855
Expected return on plan assets (1,293) (1,211) (3,816) (3,633)
Amortization of net retirement plan actuarial loss 269 244 806 731
Amortization of net retirement plan prior service (credit) cost (3) (4) (8) (11)
Net periodic benefit (income) cost (402) (353) (1,143) (1,058)
Life and Health        
Components of net periodic benefit cost        
Service cost 48 64 144 193
Interest cost 67 71 201 212
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 9 1 26 4
Amortization of net retirement plan prior service (credit) cost (15) 4 (47) 12
Net periodic benefit (income) cost 109 140 324 421
SERP Benefits        
Components of net periodic benefit cost        
Service cost 42 43 125 128
Interest cost 213 208 639 624
Expected return on plan assets 0 0 0 0
Amortization of net retirement plan actuarial loss 100 90 299 269
Amortization of net retirement plan prior service (credit) cost 22 19 65 56
Net periodic benefit (income) cost $ 377 $ 360 $ 1,128 $ 1,077