Consolidated Balance Sheet (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Trade receivables, allowance for doubtful accounts	$ 7,306	$ 7,402
Percentage of cumulative preferred stock	4.50%	4.50%
Preferred stock, par value	$ 50	$ 50
Common stock, par value	$ 0	$ 0