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COMMITMENTS AND CONTINGENCIES: (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Years ending December 31:  
2013 $ 9,507
2014 7,986
2015 6,862
2016 6,277
2017 5,755
2018 and thereafter 14,145
Total 50,532
Years ending December 31:  
2013 62,733
2014 43,063
2015 16,779
2016 4,624
2017 310
2018 and thereafter 341
Total $ 127,850