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Retirement Benefits	12 Months Ended
Retirement Benefits	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Retirement Benefits	Retirement Benefits The Company and its executive chairman of the board 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 $4.6 million in 2014. The final retirement benefit of $59.4 million, which was fully accrued at December 31, 2014, was distributed in 2015. Net retirement benefit expense was $9,994,000 in 2014, and none in 2015