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Stock-based Compensation	9 Months Ended
Stock-based Compensation	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation	Stock-based Compensation Equity Incentive Plan During the nine months ended September 30, 2017 and 2016, the Company granted annual Restricted Stock Awards (RSAs) of 48,717 and 72,317, respectively, to officers and directors of the Company. During those same periods, 17,466 and 13,319 RSAs were canceled, respectively. During the three months ended September 30, 2017 and 2016, no RSAs were granted and 3,280 and 2,719 RSAs were canceled, respectively. Employee RSAs granted in 2017 and 2016 vest over 36 months. Director RSAs generally vest at the end of 12 months. During the first nine months of 2017 and 2016, the RSAs granted were valued at $36.75 and $25.17 per share, respectively, based upon the fair value of the Company’s common stock on the date of grant. During the nine months ended September 30, 2017 and 2016, the Company granted 31,389 and 43,659 performance-based Restricted Stock Unit Awards (RSUs), respectively, to officers. During those same periods, the Company issued 38,709 and 28,424 RSUs, respectively, and canceled 19,735 and 6,602 RSUs, respectively. During the three months ended September 30, 2017 and 2016, the Company did not grant, issue or cancel any RSUs. Each RSU award reflects a target number of shares that may be issued to the award recipient. The 2017 and 2016 awards may be earned upon completion of the three-year performance period and are recognized as expense ratably over the period using a fair value of $36.75 per share and $25.17 per share, respectively, and an estimate of RSUs earned during the period. The Company has recorded compensation costs for the RSAs and RSUs in administrative and general operating expenses in the amount of $2.3 million and $2.1 million for the nine months ended September 30, 2017 and 2016, respectively.