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Retirement and Benefit Plans (Details) $ in Thousands |  |  | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 8 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May. 15, 2015 USD ($) | Mar. 09, 2015 USD ($) | May. 15, 2015 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | May. 14, 2015 USD ($) | Jun. 30, 2015 USD ($) Integer5 | Jun. 30, 2014 USD ($) | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Funded Status, Period Improvement |  |  |  |  |  | $ 69,300 |  |  |  |
Defined Benefit Plan, Actuarial Gain (Loss) |  |  |  |  |  | 19,300 |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease) |  |  |  |  |  | $ 50,000 |  |  |  |
Discount rate | 3.90% |  | 3.90% |  |  |  |  |  |  | 3.75%
Expected return on plan assets |  |  |  |  |  | 6.15% |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |  |  |  |  |  |  |
Net periodic benefit cost |  |  |  |  |  |  | $ 2,881 | $ 357 |  |
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract] |  |  |  |  |  |  |  |  |  |
Amount of actuarial loss that will be amortized from accumulated other comprehensive loss for reminder of 2015 |  |  |  |  |  |  | 2,000 |  |  |
Pension contributions [Abstract] |  |  |  |  |  |  |  |  |  |
Fair Value of Pension Contribution of Real Property |  |  |  |  |  |  | $ 3,000 |  |  |
Contributed Properties Leaseback Transaction Lease Term |  |  |  |  |  |  | 10 years |  |  |
Number of Extension Options for Contributed Properties | Integer5 |  |  |  |  |  |  | 2 |  |  |
Extension Terms of Contributed Properties |  |  |  |  |  |  | 5 years |  |  |
Rent payments for contributed properties |  |  |  |  |  |  | $ 200 |  |  |
Annual rent escalation rate for contributed properties |  |  |  |  |  |  | 2.00% |  |  |
Pension contributions | $ 40,000 | $ 10,000 | $ 50,000 |  |  |  | $ 53,203 | 780 |  |
Estimated remaining 2015 contributions |  |  |  |  |  |  | 1,000 |  |  |
Pension Plan [Member] |  |  |  |  |  |  |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  | $ 239 | $ 414 |  | 714 | 815 |  |
Interest cost |  |  |  | 4,744 | 4,929 |  | 9,451 | 10,080 |  |
Expected return on plan assets |  |  |  | (5,495) | (5,258) |  | (10,695) | (10,526) |  |
Amortization of actuarial (gain) loss |  |  |  | 1,311 | (6) |  | 2,910 | (12) |  |
Plan settlement loss |  |  |  | 0 | 0 |  | 501 | 0 |  |
Net periodic benefit cost |  |  |  | $ 799 | $ 79 |  | $ 2,881 | $ 357 |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Expected return on plan assets |  |  |  |  |  |  |  |  | 5.85% |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=49168827 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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