Revenues - Remaining Performance Obligations (Details)	6 Months Ended
	Jun. 30, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Approximate percentage of revenue related to remaining performance obligations recognized	16.00%
Performance obligation expected timing of satisfaction, period	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Approximate percentage of revenue related to remaining performance obligations recognized	25.00%
Performance obligation expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Approximate percentage of revenue related to remaining performance obligations recognized	23.00%
Performance obligation expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Approximate percentage of revenue related to remaining performance obligations recognized	100.00%
Performance obligation expected timing of satisfaction, period	6 years