Interest Expense (Schedule of Components of Interest Expense) (Parenthetical) (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Interest Expense [Abstract] | |||
| Deferred financing costs written off | $ 1,200,000 | ||
| Accretion of debt discount | $ 2,500,000 | $ 2,300,000 | $ 716,000 |