Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts receivable, allowances for doubtful accounts	$ 5,893	$ 137
Common stock, par value (in dollars per share)	$ 0.25	$ 0.25
Common stock, shares authorized	360,000,000	360,000,000
Common stock, shares issued	110,834,088	110,834,088
Treasury stock, shares	12,984,829	11,220,682