|
Basis of Presentation and Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
Customer Concentration Risk [Member]
Customer
|
Jun. 30, 2012
Customer Concentration Risk [Member]
Customer
|
Dec. 31, 2012
Customer Concentration Risk [Member]
Customer
|
Jun. 30, 2013
Revenues [Member]
Customer Concentration Risk [Member]
Customer 1 [Member]
|
Jun. 30, 2012
Revenues [Member]
Customer Concentration Risk [Member]
Customer 1 [Member]
|
Jun. 30, 2013
Revenues [Member]
Customer Concentration Risk [Member]
Customer 2 [Member]
|
Jun. 30, 2012
Revenues [Member]
Customer Concentration Risk [Member]
Customer 2 [Member]
|
Jun. 30, 2013
Accounts Receivable [Member]
Customer Concentration Risk [Member]
Customer 1 [Member]
|
Dec. 31, 2012
Accounts Receivable [Member]
Customer Concentration Risk [Member]
Customer 1 [Member]
|
Jun. 30, 2013
Accounts Receivable [Member]
Customer Concentration Risk [Member]
Customer 2 [Member]
|
Dec. 31, 2012
Accounts Receivable [Member]
Customer Concentration Risk [Member]
Customer 2 [Member]
|
Jun. 30, 2013
Property equipment building and leasehold improvements [Member]
|
Jun. 30, 2012
Property equipment building and leasehold improvements [Member]
|
Jun. 30, 2012
Property equipment building and leasehold improvements [Member]
|
|
| Long-Lived Assets to be Abandoned [Line Items] | ||||||||||||||
| Accelerated depreciation | $ 0.4 | $ 1.3 | ||||||||||||
| Impairment loss | $ 0 | $ 0.8 | ||||||||||||
| Concentration Risk [Line Items] | ||||||||||||||
| Number of major customers | 2 | 2 | 2 | |||||||||||
| Concentration risk, percentage (in hundredths) | 68.00% | 41.00% | 25.00% | 37.00% | 49.00% | 58.00% | 42.00% | 35.00% | ||||||