Restructuring charges (Tables)

12 Months Ended

Dec. 31, 2018

Restructuring And Related Activities [Abstract]

Schedule of Restructuring Charges

Restructuring charges recognized for the above actions for the years ended December 31, 2018 and 2017 are summarized as follows:

	2018		2017
Costs of contract revenues—depreciation	$	6,759	$	6,859
Costs of contract revenues—other		2,292		16,102
General and administrative expenses		185		1,189
Loss on sale of assets—net		4,572		4,691
Other expense		2,337		—
Total		16,145		28,841