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Pension and Other Postretirement Benefit Plans - Summary of Net Period Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]
Interest cost	$ 4,799	$ 4,900	$ 9,549	$ 9,802
Expected return on plan assets	(5,259)	(6,025)	(10,559)	(12,050)
Amortization of prior service credit	(359)	(358)	(717)	(716)
Amortization of actuarial loss, net	1,798	1,167	3,523	2,334
Net periodic cost (credit)	$ 979	$ (316)	$ 1,796	$ (630)

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

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-Name Accounting Standards Codification



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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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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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-Glossary Expected Return on Plan Assets



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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.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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