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Segment Reporting Segment Revenue and Profit or Loss Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]        
Revenue reconciliation $ 155,168 $ 59,569 $ 295,474 $ 121,989
Profit or loss 25,281 3,071 36,512 5,001
Operating Segments [Member]
        
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]        
Revenue reconciliation 171,392 61,574 327,928 126,722
Profit or loss 25,356 11,417 36,717 21,669
Segment Reconciling Items [Member]
        
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]        
Revenue reconciliation 975 48 975 111
Profit or loss (975) 6,849 (975) 13,174
Formation transaction expenses [Member]
        
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]        
Profit or loss 0 1,305 0 3,000
Intersegment Eliminations [Member]
        
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]        
Revenue reconciliation (17,199) (2,053) (33,429) (4,844)
Profit or loss 100 240 230 605
Segment Reconciling Items, Unallocated [Member] | Investment Income [Member]
        
Reconciliation of Revenue and Profit or Loss from Segments to Consolidated [Line Items]        
Profit or loss $ 0 $ 48 $ 0 $ 111