|
Purchase Concentrations (Details) (USD $)
In Thousands, unless otherwise specified
|
12 Months Ended |
|
Dec. 31, 2012
|
| Summary of concentration of initial purchase cost |
|
| Purchases, gross |
$ 562,335 |
| Adjustments |
(897) |
| Purchases, net |
561,438 |
| Percentage of purchase concentration |
100.00% |
|
Seller 1 [Member]
|
|
| Summary of concentration of initial purchase cost |
|
| Purchases, gross |
130,592 |
| Percentage of purchase concentration |
23.20% |
|
Seller 2 [Member]
|
|
| Summary of concentration of initial purchase cost |
|
| Purchases, gross |
81,843 |
| Percentage of purchase concentration |
14.50% |
|
Seller 3 [Member]
|
|
| Summary of concentration of initial purchase cost |
|
| Purchases, gross |
72,855 |
| Percentage of purchase concentration |
13.00% |
|
Seller 4 [Member]
|
|
| Summary of concentration of initial purchase cost |
|
| Purchases, gross |
70,876 |
| Percentage of purchase concentration |
12.60% |
|
Seller 5 [Member]
|
|
| Summary of concentration of initial purchase cost |
|
| Purchases, gross |
35,324 |
| Percentage of purchase concentration |
6.30% |
|
Other Sellers [Member]
|
|
| Summary of concentration of initial purchase cost |
|
| Purchases, gross |
$ 170,845 |
| Percentage of purchase concentration |
30.40% |