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Material Transactions Affecting Stockholders' Equity	12 Months Ended
Material Transactions Affecting Stockholders' Equity	Dec. 31, 2018
Equity [Abstract]
Material Transactions Affecting Stockholders' Equity	MATERIAL TRANSACTIONS AFFECTING STOCKHOLDERS' EQUITY Issued Common Stock On October 12, 2018, the Company issued 3,310,912 shares of it $0.01 par value common stock at a price of $25.16 as part of the consideration in the Northern States acquisition. Additional information regarding the Northern States acquisition is presented in Note 3, "Acquisitions." On January 6, 2017, the Company issued 21,057,085 shares of its $0.01 par value common stock at a price of $25.34 as part of the consideration in the Standard acquisition. Additional information regarding the Standard acquisition is presented in Note 3, "Acquisitions." Authorized Common Stock On May 17, 2017, the Company's stockholders approved and adopted an amendment to the Company's Restated Certificate of Incorporation. The amendment increased the Company's authorized common stock by 100,000,000 shares. Following this amendment, the Company is now authorized to issue a total of 251,000,000 shares, including 1,000,000 shares of preferred stock, without a par value, and 250,000,000 shares of common stock, $0.01 par value per share. Quarterly Dividend on Common Shares The Company's Board of Directors (the "Board") declared cash dividends on the Company's common stock of $0.09 per share for the first quarter of 2016, and for each of the quarters through the first quarter of 2017. The Company increased the quarterly cash dividend to $0.10 per share for each of the quarters from the second quarter of 2017 through the fourth quarter of 2017. The Company increased the quarterly cash dividend to $0.11 per share for the first through the third quarters of 2018 and increased the quarterly cash dividend to $0.12 per share for the fourth quarter of 2018. Other than share-based compensation which is disclosed in Note 17, "Share-Based Compensation", there were no additional material transactions that affected stockholders' equity during the three years ended December 31, 2018.