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Notes Payable (Interest Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]      
Document Fiscal Year Focus 2014 2013 2012
Total interest incurred $ 31,862us-gaap_InterestCostsIncurred $ 22,227us-gaap_InterestCostsIncurred $ 25,570us-gaap_InterestCostsIncurred
Interest capitalized (2,752)us-gaap_InterestCostsIncurredCapitalized (518)us-gaap_InterestCostsIncurredCapitalized (1,637)us-gaap_InterestCostsIncurredCapitalized
Total interest expense $ 29,110us-gaap_InterestExpense $ 21,709us-gaap_InterestExpense $ 23,933us-gaap_InterestExpense