Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowances for accounts receivable	$ 125,123	$ 113,357
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	1,725,000	1,725,000
Preferred stock, shares outstanding	1,725,000	1,725,000
Common stock, shares authorized	120,000,000	70,000,000
Common stock, shares issued	48,443,000	48,113,000
Common stock, shares outstanding	48,443,000	48,113,000