Equity (Details) - USD ($) $ in Thousands						12 Months Ended
	Apr. 21, 2015	Apr. 06, 2015	Feb. 27, 2015	May. 29, 2014	Sep. 10, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Apr. 02, 2015	Apr. 01, 2015
Subsidiary, Sale of Stock [Line Items]
Common stock, shares authorized						120,000,000	80,000,000
Issuance of Class A common stock, shares	7,000,000			7,500,000	9,775,000
Offering costs	$ 1,200			$ 600	$ 7,400
Proceeds from issuance of common stock	187,600			$ 181,300	$ 141,700	$ 188,720	$ 181,875	$ 149,069
Repayments of long-term debt	85,000					$ 476,982	$ 180,000	$ 130,000
Proceeds from public offering used to fund working capital	$ 102,600
Company offering shares					1,275,000
Treasury stock, shares outstanding						2,586	30,967
Forfeitures of non-vested restricted stock awards							105,126
Common Stock [Member]
Subsidiary, Sale of Stock [Line Items]
Common stock, shares authorized									120,000,000	80,000,000
Shares converted		1,500,000
Shares held in escrow		1,250,000
Harvey E Yates Company [Member]
Subsidiary, Sale of Stock [Line Items]
Shares issued upon conversion			10
Harvey E Yates Company [Member] | Convertible Preferred Stock [Member]
Subsidiary, Sale of Stock [Line Items]
Shares issued for acquisition			150,000
Shares issued as consideration in business combination			150,000
Harvey E Yates Company [Member] | Common Stock [Member]
Subsidiary, Sale of Stock [Line Items]
Shares issued for acquisition			3,300,000