Revenue (Details 2) $ in Thousands	Sep. 30, 2019 USD ($)
Period 1 [Member]
Revenue, Remaining Performance Obligation, Amount	$ 124,511
Period 2 [Member]
Revenue, Remaining Performance Obligation, Amount	309,486
Period 3 [Member]
Revenue, Remaining Performance Obligation, Amount	240,877
Period 4 [Member]
Revenue, Remaining Performance Obligation, Amount	227,201
Period 5 [Member]
Revenue, Remaining Performance Obligation, Amount	218,134
Thereafter [Member]
Revenue, Remaining Performance Obligation, Amount	$ 1,887,614