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Organization and Summary of Significant Accounting Policies (Investments and Lease Costs) (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 18, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 16, 2013
Initial Direct Costs associated with Leases |  |  |  |  |
Amortization of initial direct costs associated with leases |  | $ 1.6 | $ 1.5 | $ 1.5 |
WOLF |  |  |  |  |
Investments |  |  |  |  |
Previously held interest (as a percent) |  |  |  |  | 50.00%
Acquisition of remaining outstanding shares of previously held equity method investment (as a percent) | 50.00% |  |  |  |
Controlling interest assumed (as a percent) | 100.00% |  |  |  |
WMES |  |  |  |  |
Investments |  |  |  |  |
Ownership interest (as a percent) |  | 50.00% |  |  |
WOLF |  |  |  |  |
Investments |  |  |  |  |
Previously held interest (as a percent) |  |  |  |  | 50.00%

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