Nature of Operations (Details)	6 Months Ended
	Jun. 30, 2019 item country
Nature of Operations
Number of countries company has actively marketed rigs for land based drilling operations | country	25
Actively marketed rigs for offshore based drilling operations	33
United States and Canada
Nature of Operations
Actively marketed rigs for land based drilling operations	374
Countries Other Than United States and Canada
Nature of Operations
Actively marketed rigs for land based drilling operations	18