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Commitments and Contingencies (Details) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 16, 2015 USD ($) | May 31, 2014 USD ($) | Jun. 30, 2013 USD ($) | Dec. 31, 2016 executive_officer | Dec. 31, 2015 | Dec. 31, 2010 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of executive officers entitled to severance benefits | executive_officer |  |  |  | 4 |  |
Number of executive officers and members of Management entitled to severance benefits | executive_officer |  |  |  | 2 |  |
Bridgewater Hills Corporate Center, LLC [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Damages sought | $ 9,200,000 |  |  |  |  |
Estimate of possible loss | $ 10,000,000 |  |  |  |  |
Convertible Debt [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Debt interest rate percentage |  |  |  |  |  | 6.00%
Senior Notes Due 2024 [Member] | Senior Notes [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Debt interest rate percentage |  | 4.40% |  | 4.40% | 4.40% |
Redemption price, percentage |  | 99.883% |  |  |  |
Senior Notes Due 2023 [Member] | Senior Notes [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Debt interest rate percentage |  |  | 4.25% | 4.25% | 4.25% |
Redemption price, percentage |  |  | 99.026% |  |  |
LCIF [Member] | Financial Guarantee [Member] | Convertible Debt [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Maximum guarantee exposure |  |  |  |  |  | $ 115,000,000
LCIF [Member] | Senior Notes Due 2024 [Member] | Financial Guarantee [Member] | Senior Notes [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Maximum guarantee exposure |  | $ 250,000,000 |  |  |  |
LCIF [Member] | Senior Notes Due 2023 [Member] | Financial Guarantee [Member] | Senior Notes [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Maximum guarantee exposure |  |  | $ 250,000,000 |  |  |

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