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Statement of Cash Flows - Noncash Investing and Financing Activities	12 Months Ended
	Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]
Statement of Cash Flows - Noncash Investing and Financing Activities	24. Statement of Cash Flows – Noncash Investing and Financing Activities Noncash investing activities included liabilities (accounts payable) incurred for fixed asset acquisitions of approximately $9,515,000, $17,797,000 and $11,772,000 that were unpaid at December 31, 2015, 2014 and 2013, respectively. Noncash financing activities were immaterial for the years ended December 31, 2015 and 2014. Noncash financing activities for the year ended December 31, 2013 included 48,973 shares of Company common stock (valued at $2,999,000) issued in connection with the Company’s performance stock award plan.