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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