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Retirement Benefits	12 Months Ended
Retirement Benefits	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Retirement Benefits	Retirement Benefits The Company and its chairman of the board and chief executive officer entered into an unfunded supplemental benefit agreement (SBA) in 2004. On March 28, 2013, the Company agreed to terminate and distribute the retirement benefit of the SBA. As a result, the Company distributed retirement benefits of $0.3 million and $4.6 million in 2013 and 2014, respectively. The final retirement benefit of $59.4 million, which is fully accrued at December 31, 2014, will be distributed during the first quarter of 2015. Net retirement benefit expense was $7,696,000, $13,357,000 and $9,994,000 in 2012, 2013 and 2014, respectively.