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Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Adjustment of accumulated other comprehensive income						$ 2,400
Transition obligation period of recognition	20 years
Net actuarial loss that will be amortized from Accumulated other comprehensive income (loss) in next fiscal year	$ 2,300
Prior service credit that will be amortized from Accumulated other comprehensive income (loss) in next fiscal year	$ 0
Assumptions used to determine benefit obligations [Abstract]
Expected long-term return on plan assets				7.00%	7.50%	7.50%
Rate of compensation increase				3.00%		3.00%
Assumptions used to determine net periodic pension cost [Abstract]
Discount rate			3.50%
Expected long-term return on plan assets	7.50%	7.50%	7.50%
Rate of compensation increase			3.00%
Other changes in plan assets and benefit obligation recognized in other comprehensive income (pre-tax) [Abstract]
Amortization of prior service cost	$ (2,239)	$ (75)	$ (2,790)
Amortization of unrecognized net gain	$ (6,144)	(19,245)	21,923
Estimate future benefit payments [Abstract]
Annual rates of increase in the per capita cost of covered medical and prescription drug benefits, minimum	6.80%
Annual rates of increase in the per capita cost of covered medical and prescription drug benefits, maximum	11.00%
Ultimate health care cost trend rate	3.90%
Actual plan asset allocations [Abstract]
Actual plan asset allocations				100.00%	100.00%
Employer contributions to 401 (k) plan	$ 2,500	$ 2,800	2,100
Effect of one-percentage point change in assumed health care cost trend rates [Abstract]
One-percentage point Increase on total service and interest cost components	38
One-percentage point (decrease) on total service and interest cost components	(33)
One-percentage point Increase on postretirement accumulated benefit obligation	778
One-percentage point (decrease) on postretirement accumulated benefit obligation	$ (670)
Minimum [Member]
Assumptions used to determine benefit obligations [Abstract]
Discount rate				4.69%	4.19%	4.90%
Rate of compensation increase					3.00%
Assumptions used to determine net periodic pension cost [Abstract]
Discount rate	4.19%	4.90%
Rate of compensation increase	3.00%	3.00%
Maximum [Member]
Assumptions used to determine benefit obligations [Abstract]
Discount rate				4.71%	4.30%	5.05%
Rate of compensation increase					3.75%
Assumptions used to determine net periodic pension cost [Abstract]
Discount rate	4.30%	5.05%
Rate of compensation increase	3.75%	3.75%
Pension Benefits [Member]
Accumulated other comprehensive income (loss), before tax [Abstract]
Net actuarial loss				$ 33,070	$ 28,767
Prior service cost				76	97
Total amounts recognized in accumulated other comprehensive loss (pre-tax)				33,146	28,864
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	$ 98,556	$ 85,667
Service cost	2,677	2,290	2,493
Interest cost	3,977	4,142	3,223
Plan participants' contributions	0	0
Actuarial (gain) loss	(5,225)	12,501
Settlement	(200)	0
Benefits paid	(7,340)	(6,044)
Projected benefit obligation at end of year	92,445	98,556	85,667
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	117,232	118,574
Actual return on plan assets	(3,159)	3,950
Employer contributions	796	752
Plan participants' contributions	0	0
Benefits paid	(7,340)	(6,044)
Fair value of plan assets at end of year	107,529	117,232	118,574
Funded status				15,084	18,676
Accumulated benefit obligation				92,400	98,600
Amounts recognized in Balance Sheet [Abstract]
Other assets				34,965	39,044
Other liabilities				(19,881)	(20,368)
Funded status				15,084	18,676
Components of net periodic benefit cost [Abstract]
Service cost	2,677	2,290	2,493
Interest cost	3,977	4,142	3,223
Expected return on plan assets	(8,589)	(8,681)	(7,804)
Amortization of gain due to settlement	(154)	0	0
Amortization of prior service cost	21	23	23
Amortization of unrecognized net loss	2,174	79	2,692
Net periodic pension cost	106	(2,147)	627
Other changes in plan assets and benefit obligation recognized in other comprehensive income (pre-tax) [Abstract]
Net loss (gain)	6,523	17,233	(21,500)
Prior service cost	0	0	0
Amortization of gain due to settlement	(46)	0	0
Amortization of prior service cost	(21)	(23)	(23)
Amortization of unrecognized net gain	(2,174)	(79)	(2,692)
Total recognized in other comprehensive loss (income)	4,282	17,131	(24,215)
Total recognized in net periodic benefit cost and other comprehensive income (loss) - pre-tax	4,388	14,984	(23,588)
Estimate future benefit payments [Abstract]
2016				6,165
2017				7,649
2018				7,123
2019				7,024
2020				6,881
2021 - 2025				36,842
Actual plan asset allocations [Abstract]
Fair value of plan assets	117,232	117,232	118,574	107,529	117,232	$ 118,574
Pension Benefits [Member] | Level 1 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	72,722
Fair value of plan assets at end of year	62,848	72,722
Actual plan asset allocations [Abstract]
Fair value of plan assets	62,848	72,722		62,848	72,722
Pension Benefits [Member] | Level 2 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	44,510
Fair value of plan assets at end of year	44,681	44,510
Actual plan asset allocations [Abstract]
Fair value of plan assets	44,681	44,510		$ 44,681	$ 44,510
Pension Benefits [Member] | Cash and Cash Equivalents [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	4,423
Fair value of plan assets at end of year	$ 2,513	4,423
Target asset allocations [Abstract]
Target allocation percentage of assets, range minimum	0.00%
Target allocation percentage of assets, range maximum	20.00%
Actual plan asset allocations [Abstract]
Actual plan asset allocations				2.00%	4.00%
Fair value of plan assets	$ 4,423	4,423		$ 2,513	$ 4,423
Pension Benefits [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	4,423
Fair value of plan assets at end of year	2,513	4,423
Actual plan asset allocations [Abstract]
Fair value of plan assets	2,513	4,423		2,513	4,423
Pension Benefits [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
Actual plan asset allocations [Abstract]
Fair value of plan assets	$ 0	0		$ 0	$ 0
Pension Benefits [Member] | Fixed Income Securities [Member]
Target asset allocations [Abstract]
Target allocation percentage of assets, range minimum	20.00%
Target allocation percentage of assets, range maximum	40.00%
Actual plan asset allocations [Abstract]
Actual plan asset allocations				42.00%	38.00%
Pension Benefits [Member] | Equity [Member]
Target asset allocations [Abstract]
Target allocation percentage of assets, range minimum	40.00%
Target allocation percentage of assets, range maximum	80.00%
Actual plan asset allocations [Abstract]
Actual plan asset allocations				56.00%	58.00%
Pension Benefits [Member] | Foreign Equity Mutual Funds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 38,581
Fair value of plan assets at end of year	33,342	38,581
Actual plan asset allocations [Abstract]
Fair value of plan assets	38,581	38,581		$ 33,342	$ 38,581
Pension Benefits [Member] | Foreign Equity Mutual Funds [Member] | Level 1 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	38,581
Fair value of plan assets at end of year	33,342	38,581
Actual plan asset allocations [Abstract]
Fair value of plan assets	38,581	38,581		33,342	38,581
Pension Benefits [Member] | Foreign Equity Mutual Funds [Member] | Level 2 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
Actual plan asset allocations [Abstract]
Fair value of plan assets	0	0		0	0
Pension Benefits [Member] | Equity Mutual Funds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	29,718
Fair value of plan assets at end of year	26,993	29,718
Actual plan asset allocations [Abstract]
Fair value of plan assets	29,718	29,718		26,993	29,718
Pension Benefits [Member] | Equity Mutual Funds [Member] | Level 1 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	29,718
Fair value of plan assets at end of year	26,993	29,718
Actual plan asset allocations [Abstract]
Fair value of plan assets	26,993	29,718		26,993	29,718
Pension Benefits [Member] | Equity Mutual Funds [Member] | Level 2 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
Actual plan asset allocations [Abstract]
Fair value of plan assets	0	0		0	0
Pension Benefits [Member] | US Government Bonds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	4,420
Fair value of plan assets at end of year	3,410	4,420
Actual plan asset allocations [Abstract]
Fair value of plan assets	4,420	4,420		3,410	4,420
Pension Benefits [Member] | US Government Bonds [Member] | Level 1 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
Actual plan asset allocations [Abstract]
Fair value of plan assets	0	0		0	0
Pension Benefits [Member] | US Government Bonds [Member] | Level 2 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	4,420
Fair value of plan assets at end of year	3,410	4,420
Actual plan asset allocations [Abstract]
Fair value of plan assets	3,410	4,420		3,410	4,420
Pension Benefits [Member] | Corporate Bonds [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	40,090
Fair value of plan assets at end of year	41,271	40,090
Actual plan asset allocations [Abstract]
Fair value of plan assets	41,271	40,090		41,271	40,090
Pension Benefits [Member] | Corporate Bonds [Member] | Level 1 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
Actual plan asset allocations [Abstract]
Fair value of plan assets	0	0		0	0
Pension Benefits [Member] | Corporate Bonds [Member] | Level 2 [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	40,090
Fair value of plan assets at end of year	41,271	40,090
Actual plan asset allocations [Abstract]
Fair value of plan assets	41,271	40,090		41,271	40,090
Other Benefits [Member]
Accumulated other comprehensive income (loss), before tax [Abstract]
Net actuarial loss				2,333	2,929
Prior service cost				(95)	(314)
Total amounts recognized in accumulated other comprehensive loss (pre-tax)				2,238	2,615
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	8,710	7,428
Service cost	17	16	23
Interest cost	374	347	286
Plan participants' contributions	263	266
Actuarial (gain) loss	(333)	1,452
Settlement	0	0
Benefits paid	(709)	(799)
Projected benefit obligation at end of year	8,322	8,710	7,428
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	446	533
Plan participants' contributions	263	266
Benefits paid	(709)	(799)
Fair value of plan assets at end of year	0	0	0
Funded status				(8,322)	(8,710)
Accumulated benefit obligation				8,300	8,700
Amounts recognized in Balance Sheet [Abstract]
Other assets				0	0
Other liabilities				(8,322)	(8,710)
Funded status				(8,322)	(8,710)
Components of net periodic benefit cost [Abstract]
Service cost	17	16	23
Interest cost	374	347	286
Expected return on plan assets	0	0	0
Amortization of gain due to settlement	0	0	0
Amortization of prior service cost	(219)	(206)	(205)
Amortization of unrecognized net loss	263	151	280
Net periodic pension cost	435	308	384
Other changes in plan assets and benefit obligation recognized in other comprehensive income (pre-tax) [Abstract]
Net loss (gain)	(333)	1,452	(369)
Prior service cost	0	0	(54)
Amortization of gain due to settlement	0	0	0
Amortization of prior service cost	219	206	205
Amortization of unrecognized net gain	(263)	(151)	(280)
Total recognized in other comprehensive loss (income)	(377)	1,507	(498)
Total recognized in net periodic benefit cost and other comprehensive income (loss) - pre-tax	58	1,815	(114)
Estimate future benefit payments [Abstract]
2016				621
2017				647
2018				671
2019				661
2020				676
2021 - 2025				3,259
Actual plan asset allocations [Abstract]
Fair value of plan assets	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0

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Represents adjustment amount of of accumulated other comprehensive income during the period.

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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The maximum assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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The minimum assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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Total amount recognized in net periodic benefit cost and other comprehensive income (loss).

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The weighted average period over which the transition obligation is expected to be recognized.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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This represents the entire assets recognized in the balance sheet that are associated with the defined benefit plans.

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Expected rate of compensation increases (for pay-related plans).

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Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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