Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property and equipment - net of depreciation	$ 282,974us-gaap_PropertyPlantAndEquipmentNet	$ 146,542us-gaap_PropertyPlantAndEquipmentNet
Common stock, par value per share	$ 0.50	$ 0.50
Common stock, authorized shares	30,000,000us-gaap_CommonStockSharesAuthorized	30,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued shares	20,636,478us-gaap_CommonStockSharesIssued	20,563,023us-gaap_CommonStockSharesIssued
Common stock, outstanding shares	20,636,478us-gaap_CommonStockSharesOutstanding	20,563,023us-gaap_CommonStockSharesOutstanding
Centennial Founders, LLC
Property and equipment - net of depreciation	$ 77,131	$ 74,726

Face amount or stated value per share of common stock.

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