Accrued Expenses and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Other Liabilities Disclosure [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

December 31,	2018		2017
Payroll and related employee benefits	$	78,414	$	68,210
Accrued insurance		58,519		39,946
Performance guarantees (see Note 1)		88,213		88,606
Other		48,480		39,645
Total	$	273,626	$	236,407