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Commitments and Contingencies (Narrative) (Details) $ in Millions |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 10, 2017 USD ($) | Jan. 25, 2017 USD ($) | Jan. 24, 2017 USD ($) | Nov. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Apr. 01, 2016 plaintiff | Mar. 08, 2013 Subcontractor | Feb. 28, 2017 USD ($) | Apr. 30, 2011 Employee | Dec. 31, 2016 | Jun. 17, 2016 USD ($) | May 01, 2012 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capitalization of construction costs |  |  |  |  |  |  |  |  |  |  |  | $ 27.3
Number of subcontractors for lawsuits filed | Subcontractor |  |  |  |  |  |  | 2 |  |  |  |  |
Number of deaths of subcontractor employees | Employee |  |  |  |  |  |  |  |  | 5 |  |  |
Operating Leases | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  |  |  |  |  | 2 years |  |
Operating Leases | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  |  |  |  |  | 15 years |  |
Building Facilities |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  |  |  |  |  | 15 years |  |
Anchorage Litigation | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement payments |  | $ 3.8 |  |  |  |  |  |  |  |  |  |
Anchorage Litigation | ICRC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement payments paid by insurers |  | $ 3.0 |  |  |  |  |  |  |  |  |  |
Heritage Disposal and Storage |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount |  |  |  |  | $ 4.8 |  |  |  |  |  |  |
Litigation settlement over estimated amount |  |  |  |  |  |  |  |  |  |  | $ (1.5) |
Heritage Disposal and Storage | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount |  |  | $ 3.5 |  |  |  |  |  |  |  |  |
Payments for legal settlements | $ 3.3 |  |  |  |  |  |  |  |  |  |  |
Aviation Litigation |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of deaths | plaintiff |  |  |  |  |  | 1 |  |  |  |  |  |
Number of injured | plaintiff |  |  |  |  |  | 2 |  |  |  |  |  |
Damages sought |  |  |  | $ 1.0 |  |  |  |  |  |  |  |
ICRC | Anchorage Litigation | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from legal settlements |  |  |  |  |  |  |  | $ 10.4 |  |  |  |

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