|
Consolidated Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified |
Dec. 31, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Allowance for doubtful accounts | $ 2,264 | $ 2,286 |
| Common units issued (in shares) | 30,786,100 | 25,183,039 |
| Common units outstanding (in shares) | 30,786,100 | 25,183,039 |
| Common units held in treasury (in shares) | 4,154,371 | 2,808,725 |
| Common units held in treasury, at cost | $ 63,181 | $ 48,099 |