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Commitments and Contingencies: (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Contingent Liabilities          
Operating lease rent expense $ 2,708 $ 2,666 $ 5,377 $ 5,301  
Contingent liability under letters of credit 18,388   18,388   18,862
Outstanding obligations under construction agreements $ 36,720   $ 36,720