Fair Value Measurements (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	$ 140,882	$ 152,719
Restricted cash and cash equivalents	14,561	15,134
Derivative Asset	0	0
Total	155,443	167,853
Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Restricted cash and cash equivalents	0	0
Derivative Asset	115	4,886
Total	115	4,886
Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0	0
Restricted cash and cash equivalents	0	0
Derivative Asset	0	0
Total	0	0
Estimate of Fair Value Measurement
Assets:
Cash and cash equivalents	140,882	152,719
Restricted cash and cash equivalents	14,561	15,134
Derivative Asset	115	4,886
Total	$ 155,558	$ 172,739