Quarterly report pursuant to Section 13 or 15(d)

Accounting Policies - Allocation of Expenses (Details)

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Accounting Policies - Allocation of Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Accounting Policies    
Allocated general corporate costs $ 5,700 $ 13,600
Allocated operating expenses $ 1,200 5,600
Understatement of Allocation of Corporate Expense    
Accounting Policies    
Correction or error, amount   $ 1,900