Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Long-term Purchase Commitment [Table Text Block]

	Amount of Commitment Expiration Per Period
	Total Amounts Committed		Less Than 1  Year		1-3 Years		3-5 Years		Beyond 5  Years
Letters of Credit:
Employee-Related	$	82,273	$	67,871	$	14,402	$	—	$	—
Environmental	998		600		398		—		—
Other	242,405		228,313		14,092		—		—
Total Letters of Credit	325,676		296,784		28,892		—		—
Surety Bonds:
Employee-Related	112,810		111,510		1,300		—		—
Environmental	514,851		483,604		31,247		—		—
Other	22,417		21,591		824		2		—
Total Surety Bonds	650,078		616,705		33,371		2		—
Guarantees:
Other	74,203		41,285		17,767		13,401		1,750
Total Guarantees	74,203		41,285		17,767		13,401		1,750
Total Commitments	$	1,049,957	$	954,774	$	80,030	$	13,403	$	1,750

Unrecorded Unconditional Purchase Obligations Disclosure

. These purchase obligations are not recorded on the Consolidated Balance Sheets. As of December 31, 2016, the purchase obligations for each of the next five years and beyond were as follows:

Obligations Due	Amount
Less than 1 year	$	209,797
1 - 3 years	285,224
3 - 5 years	243,534
More than 5 years	622,509
Total Purchase Obligations	$	1,361,064