Pension | Other Postretirement Benefits | ||||||||||||||||||||||
Years ended December 31, | 2013 | 2012 | 2011 | 2013 | 2012 | 2011 | |||||||||||||||||
Service cost | $1,886 | $1,649 | $1,406 | $148 | $146 | $221 | |||||||||||||||||
Interest cost | 2,906 | 3,005 | 3,116 | 263 | 313 | 484 | |||||||||||||||||
Expected return on plan assets | (3,874 | ) | (3,831 | ) | (3,741 | ) | (6 | ) | (7 | ) | (6 | ) | |||||||||||
Amortization of prior service costs | 196 | 225 | 244 | (180 | ) | (197 | ) | (96 | ) | ||||||||||||||
Recognized net actuarial loss | 2,231 | 1,937 | 1,254 | 95 | 119 | 178 | |||||||||||||||||
Settlement and curtailment loss | 104 | 25 | 64 | (1 | ) | 3 | |||||||||||||||||
Net periodic benefit cost | $3,449 | $3,010 | $2,343 | $320 | $373 | $784 | |||||||||||||||||
Net periodic benefit cost included in Earnings from operations | $3,036 | $2,407 | $1,648 | $353 | $543 | $692 | |||||||||||||||||