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Commitments and Contingencies: (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Contingent Liabilities        
Operating lease rent expense $ 2,968 $ 2,667 $ 8,879 $ 8,044
Contingent liability under letters of credit 2,788   2,788  
Outstanding obligations under construction agreements $ 79,960   $ 79,960