Commitments and Contingencies (Textual) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
Commitments and Contingencies Disclosure [Abstract] | |||
Future obligations under leases | $ 135.7 | ||
Outstanding letters of credit and performance bonds | 3.8 | ||
Lease operating expenses | $ 2.4 | $ 2.0 | $ 1.3 |
Other Commitments [Line Items] | |||
Weighted average remaining term (in years) | 3 years | ||
Ground Leases | |||
Other Commitments [Line Items] | |||
Weighted average remaining term (in years) | 78 years | ||
Ground and Operating Lease Commitments | |||
Other Commitments [Line Items] | |||
Future lease commitments | $ 211.2 |