Commitments and Contingent Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Commitment Expiration

The Company's management believes that these guarantees will expire without being funded, and therefore, the commitments will not have a material adverse effect on the Company's financial condition.

	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	$	77,266	$	60,364	$	16,902	$	—	$	—
Environmental	998		600		398		—		—
Other	9,847		9,147		700		—		—
Total Letters of Credit	88,111		70,111		18,000		—		—
Surety Bonds:
Employee-Related	108,948		108,948		—		—		—
Environmental	453,035		453,035		—		—		—
Other	4,717		4,716		—		1		—
Total Surety Bonds	566,700		566,699		—		1		—
Guarantees:
Other	33,302		9,216		15,413		7,893		780
Total Guarantees	33,302		9,216		15,413		7,893		780
Total Commitments	$	688,113	$	646,026	$	33,413	$	7,894	$	780