Fair Value Measurements (Fair Value Measurements on a Nonrecurring Basis) (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Level 3 | Nonrecurring
Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
Real estate asset		$ 14,971,000
Real Estate
Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
Real estate asset	$ 0
Real Estate | Nonrecurring
Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
Real estate asset		14,971,000
Real Estate | Level 1 | Nonrecurring
Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
Real estate asset		0
Real Estate | Level 2 | Nonrecurring
Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
Real estate asset		$ 0