Fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
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+ References

No definition available.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Postretirement benefits (plan assets) (Details) - Postretirement benefit plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Postretirement benefits [Line Items]
Allocation of plan assets	100.00%	100.00%
Fair value of plan assets	$ 118,128	$ 117,134	$ 124,675
Investments measured at net asset value	45,058	44,970
Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	26,459	27,468
Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	46,611	44,696
Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	$ 0	$ 0
Equity securities [Member] \| International [Member]
Postretirement benefits [Line Items]
Allocation of plan assets	18.00%	18.00%
Target allocation of plan assets	18.00%
Fair value of plan assets	$ 21,268	$ 21,209
Investments measured at net asset value	0	0
Equity securities [Member] \| International [Member] \| Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	20,768	20,520
Equity securities [Member] \| International [Member] \| Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	500	689
Equity securities [Member] \| International [Member] \| Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	$ 0	$ 0
Equity securities [Member] \| Large capitalization [Member] \| United States [Member]
Postretirement benefits [Line Items]
Allocation of plan assets	33.00%	33.00%
Target allocation of plan assets	33.00%
Fair value of plan assets	$ 38,731	$ 38,629
Investments measured at net asset value	38,731	38,629
Equity securities [Member] \| Large capitalization [Member] \| United States [Member] \| Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	0	0
Equity securities [Member] \| Large capitalization [Member] \| United States [Member] \| Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	0	0
Equity securities [Member] \| Large capitalization [Member] \| United States [Member] \| Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	$ 0	$ 0
Equity securities [Member] \| Small and mid-capitalization [Member] \| United States [Member]
Postretirement benefits [Line Items]
Allocation of plan assets	7.00%	7.00%
Target allocation of plan assets	7.00%
Fair value of plan assets	$ 8,091	$ 8,095
Investments measured at net asset value	2,280	1,211
Equity securities [Member] \| Small and mid-capitalization [Member] \| United States [Member] \| Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	5,691	6,799
Equity securities [Member] \| Small and mid-capitalization [Member] \| United States [Member] \| Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	120	85
Equity securities [Member] \| Small and mid-capitalization [Member] \| United States [Member] \| Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	$ 0	$ 0
Mortgage-backed securities [Member]
Postretirement benefits [Line Items]
Allocation of plan assets	16.00%	17.00%
Fair value of plan assets	$ 18,787	$ 20,157
Investments measured at net asset value	3,245	4,441
Mortgage-backed securities [Member] \| Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	0	0
Mortgage-backed securities [Member] \| Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	15,542	15,716
Mortgage-backed securities [Member] \| Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	$ 0	$ 0
U.S. corporate debt securities [Member]
Postretirement benefits [Line Items]
Allocation of plan assets	13.00%	15.00%
Fair value of plan assets	$ 15,555	$ 16,974
Investments measured at net asset value	802	689
U.S. corporate debt securities [Member] \| Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	0	0
U.S. corporate debt securities [Member] \| Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	14,753	16,285
U.S. corporate debt securities [Member] \| Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	$ 0	$ 0
Government debt securities [Member]
Postretirement benefits [Line Items]
Allocation of plan assets	13.00%	10.00%
Fair value of plan assets	$ 15,104	$ 11,808
Investments measured at net asset value	0	0
Government debt securities [Member] \| Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	0	0
Government debt securities [Member] \| Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	15,104	11,808
Government debt securities [Member] \| Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	0	0
Other debt securities [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	592	262
Investments measured at net asset value	0	0
Other debt securities [Member] \| Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	0	149
Other debt securities [Member] \| Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	592	113
Other debt securities [Member] \| Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	$ 0	$ 0
Fixed income securities [Member]
Postretirement benefits [Line Items]
Target allocation of plan assets	42.00%