Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Consolidated Balance Sheets
Accounts receivable - trade, allowance (in dollars)	$ 692	$ 1,021
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares issued	43,689,223	43,479,186
Common stock, shares outstanding	43,689,223	43,479,186