| Components of Net Periodic Benefit Costs |
Components of net periodic costs (benefits) for the three and six months ended June 30 are as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | CWP | | Workers' Compensation | | Three Months Ended | | Six Months Ended | | Three Months Ended | | Six Months Ended | | June 30, | | June 30, | | June 30, | | June 30, | | 2013 | | 2012 | | 2013 | | 2012 | | 2013 | | 2012 | | 2013 | | 2012 | Service cost | $ | 2,135 |
| | $ | 1,928 |
| | $ | 4,270 |
| | $ | 3,856 |
| | $ | 3,533 |
| | $ | 3,634 |
| | $ | 7,066 |
| | $ | 7,268 |
| Interest cost | 1,808 |
| | 1,991 |
| | 3,616 |
| | 3,982 |
| | 1,655 |
| | 1,778 |
| | 3,310 |
| | 3,556 |
| Amortization of actuarial gain | (4,212 | ) | | (4,933 | ) | | (8,425 | ) | | (9,867 | ) | | (699 | ) | | (986 | ) | | (1,398 | ) | | (1,972 | ) | State administrative fees and insurance bond premiums | — |
| | — |
| | — |
| | — |
| | 1,345 |
| | 1,635 |
| | 3,004 |
| | 3,545 |
| Legal and administrative costs | — |
| | — |
| | — |
| | — |
| | 591 |
| | 648 |
| | 1,182 |
| | 1,296 |
| Net periodic (benefit) cost | $ | (269 | ) | | $ | (1,014 | ) | | $ | (539 | ) | | $ | (2,029 | ) | | $ | 6,425 |
| | $ | 6,709 |
| | $ | 13,164 |
| | $ | 13,693 |
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