Interest Expense (Schedule of Components of Interest Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Interest Expense [Abstract]      
Cash and accrued $ 30,981 $ 28,851 $ 14,130
Amortization of deferred financing costs [1],[2] 3,584 3,067 2,322
Capitalized interest (3,879) (4,347) (3,284)
Total interest expense $ 30,686 $ 27,571 $ 13,168
[1] The year ended December 31, 2013 includes $1.2 million of deferred financing costs written off as a result of the Revolving Credit Facility. For more information, see Note 4. “Long-Term Debt - Second Amended and Restated Revolving Credit Facility.”
[2] The years ended December 31, 2015, 2014 and 2013 include $2.5 million, $2.3 million and $716,000, respectively, of debt discount accretion related to the Notes.