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Retirement Plans: | 12 Months Ended
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Dec. 31, 2012
Retirement Plans: | 14. Retirement Plans: The Company maintains three qualified contributory savings plans as allowed under Section 401(k) of the Internal Revenue Code and Section 1165(e) of the Puerto Rico Income Tax Act of 1954 (the “401(k) Plans”). The 401(k) Plans permit participant contributions and allow elective and, in certain situations, non-elective Company contributions based on each participant’s contribution or a specified percentage of eligible wages. Participants may defer a percentage of their annual compensation subject to the limits defined in the 401(k) Plans. The Company recorded an expense of $24.8 million, $20.3 million and $18.2 million for the years ended December 31, 2012, 2011 and 2010, respectively, primarily related to the 401(k) Plans.

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