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Employee Benefit Plans (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
DB Pension Plan      
Components of net periodic benefit cost      
Service cost $ 0 $ 1,587 $ 2,434
Interest cost 2,473 2,987 3,069
Expected return on plan assets (4,844) (5,028) (5,024)
Amortization of prior service (credit) cost (15) (448) (123)
Recognized net actuarial loss 975 1,573 859
Recognized net actuarial gain due to curtailments 0 (6,003) 0
Net periodic benefit (credit) cost (1,411) (5,332) 1,215
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial loss (gain) 1,880 (169) 19,027
Recognized actuarial loss (975) (1,573) (859)
Prior service credit 0 0 (6,282)
Recognized prior service cost (credit) 15 6,451 123
Recognized in other comprehensive income (loss) 920 4,709 12,009
Total recognized in net periodic benefit cost and other comprehensive income (491) (623) 13,224
Life and Healthcare Plan      
Components of net periodic benefit cost      
Service cost 258 236 201
Interest cost 283 323 367
Expected return on plan assets 0 0 0
Amortization of prior service (credit) cost 16 16 16
Recognized net actuarial loss 5 19 0
Recognized net actuarial gain due to curtailments 0 0 0
Net periodic benefit (credit) cost 562 594 584
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial loss (gain) 210 (467) 192
Recognized actuarial loss (5) (19) 0
Prior service credit 0 0 0
Recognized prior service cost (credit) (16) (16) (16)
Recognized in other comprehensive income (loss) 189 (502) 176
Total recognized in net periodic benefit cost and other comprehensive income 751 92 760
SERPs      
Components of net periodic benefit cost      
Service cost 171 201 222
Interest cost 832 928 866
Expected return on plan assets 0 0 0
Amortization of prior service (credit) cost 75 73 112
Recognized net actuarial loss 358 626 206
Recognized net actuarial gain due to curtailments 0 0 0
Net periodic benefit (credit) cost 1,436 1,828 1,406
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial loss (gain) 697 (1,210) 4,992
Recognized actuarial loss (358) (626) (206)
Prior service credit 188 0 0
Recognized prior service cost (credit) (75) (73) (112)
Recognized in other comprehensive income (loss) 452 (1,909) 4,674
Total recognized in net periodic benefit cost and other comprehensive income $ 1,888 $ (81) $ 6,080