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Commitments and Contingencies (Details) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 06, 2017 USD ($) | Sep. 16, 2015 USD ($) | May 31, 2014 USD ($) | Jun. 30, 2013 USD ($) | Dec. 31, 2017 USD ($) executive_officer | Jan. 31, 2018 USD ($) | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of executive officers entitled to severance benefits | executive_officer |  |  |  |  | 4 |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Maximum retirement agreement amount |  |  |  |  |  | $ 795,000 |
Senior Notes [Member] | Senior Notes Due 2024 [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Debt interest rate percentage |  |  | 4.40% |  | 4.40% |  | 4.40%
Redemption price, percentage |  |  | 99.883% |  |  |  |
Senior Notes [Member] | Senior Notes Due 2023 [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Debt interest rate percentage |  |  |  | 4.25% | 4.25% |  | 4.25%
Redemption price, percentage |  |  |  | 99.026% |  |  |
LCIF [Member] | Senior Notes [Member] | Senior Notes Due 2024 [Member] | Financial Guarantee [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Maximum guarantee exposure |  |  | $ 250,000,000 |  |  |  |
LCIF [Member] | Senior Notes [Member] | Senior Notes Due 2023 [Member] | Financial Guarantee [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Maximum guarantee exposure |  |  |  | $ 250,000,000 |  |  |
Maximum [Member] | LCIF [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Debt interest rate percentage |  |  |  |  | 6.50% |  | 6.50%
Bridgewater Hills Corporate Center, LLC [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Damages sought |  | $ 9,200,000 |  |  |  |  |
Amount awarded to other party | $ 2,050,000 |  |  |  |  |  |
Legal fees |  |  |  |  | $ 2,255,000 |  |
Bridgewater Hills Corporate Center, LLC [Member] | Maximum [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Estimate of possible loss |  | $ 10,000,000 |  |  |  |  |

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