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Subordinated Debentures and Convertible Notes - Schedule of Convertible Debt (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 07, 2018
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]                
Repurchase of treasury stock     $ 50,000 $ 78,961 $ 100,000   $ 78,961  
Convertible Notes                
Debt Instrument [Line Items]                
Repurchase of treasury stock $ 76,000         $ 24,000   $ 150,000
Interest expense on convertible notes   $ 2,300   $ 1,200 $ 4,600      
Amortization/ Capitalization Period 5 years       5 years     5 years
Gross Carrying Amount                
Convertible notes principal balance   217,500 217,500   $ 217,500     $ 217,500
Discount   (21,880) (21,880)   (21,880)     (21,880)
Issuance costs to be capitalized   (4,119) (4,119)   (4,119)     (4,119)
Carrying balance of convertible notes   191,501 191,501   191,501     191,501
Accumulated Amortization / Capitalization                
Discount   4,580 2,544   4,580     2,544
Issuance costs to be capitalized   896 498   896     498
Carrying balance of convertible notes   5,476 3,042   5,476     3,042
Carrying Amount                
Convertible notes principal balance   217,500 217,500   217,500     217,500
Discount   (17,300) (19,336)   (17,300)     (19,336)
Issuance costs to be capitalized   (3,223) (3,621)   (3,223)     (3,621)
Carrying balance of convertible notes   $ 196,977 $ 194,543   $ 196,977     $ 194,543