Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands					2 Months Ended	3 Months Ended		4 Months Ended	6 Months Ended		12 Months Ended
	Feb. 26, 2019	Dec. 27, 2018	Nov. 08, 2018	Apr. 24, 2018	Feb. 26, 2019	Mar. 31, 2019	Jun. 30, 2018	Feb. 26, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Class of Stock [Line Items]
Number of shares sold (in shares)		312,065							54,750
Proceeds retained (in excess of)	$ 30,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs						$ 11,985
Common stock issuance costs									$ (10,514)	$ 0	$ (1,500)
PreferredStockFairValue											$ 402,884
Common Stock
Class of Stock [Line Items]
Proceeds from issuance of stock	$ 450,000
Number of shares sold (in shares)	36,000,000				7,107,049
Subscription price (in dollars per share)	$ 12.50				$ 12.50			$ 12.50
Series B Preferred Stock
Class of Stock [Line Items]
Shares Issued, Price Per Share											$ 1,000
Preferred Stock, Shares Issued											155,000
Preferred Stock, Redemption Term											8 years
Preferred Stock, Shares Outstanding											155,000
Preferred Stock, Dividend Rate, Percentage											17.78%
PreferredStockFairValue											$ 205,972
Series C Preferred Stock
Class of Stock [Line Items]
Shares Issued, Price Per Share											$ 1,000
Preferred Stock, Shares Issued											55,000
Preferred Stock, Redemption Term											8 years
Preferred Stock, Shares Outstanding											55,000
Preferred Stock, Dividend Rate, Percentage											17.78%
PreferredStockFairValue											$ 102,098
Series D Preferred Stock
Class of Stock [Line Items]
Shares Issued, Price Per Share											$ 1.00
Preferred Stock, Shares Issued											100
Preferred Stock, Redemption Term											8 years
Preferred Stock, Shares Outstanding											100
PreferredStockFairValue											$ 900
Series E Preferred Stock
Class of Stock [Line Items]
Shares Issued, Price Per Share											$ 1,000
Preferred Stock, Shares Issued											90,000
Preferred Stock, Redemption Term											6 years
Preferred Stock, Shares Outstanding											37,500
Preferred Stock, Dividend Rate, Percentage											16.03%
PreferredStockFairValue											$ 47,367
Series E-1 Preferred Stock
Class of Stock [Line Items]
Proceeds from issuance of stock									$ 17,500
Number of shares sold (in shares)									17,500
Shares Issued, Price Per Share									$ 1,000
Preferred Stock, Shares Issued											35,728
Preferred Stock, Redemption Term											6 years
Payments of Stock Issuance Costs										1,100
Preferred Stock, Shares Outstanding											35,728
Preferred Stock, Dividend Rate, Percentage											16.03%
PreferredStockFairValue											$ 46,547
Series E-1 Preferred Stock Tranche 2
Class of Stock [Line Items]
Number of shares sold (in shares)									18,228
Preferred Stock, Par or Stated Value Per Share									$ 0.01
Shares Issued, Price Per Share									$ 960
Series E-1 Preferred Stock Tranche 3
Class of Stock [Line Items]
Number of shares sold (in shares)									19,022
Shares Issued, Price Per Share									$ 920
E-1FirstTranche [Member] | Series E-1 Preferred Stock
Class of Stock [Line Items]
Proceeds from issuance of stock				$ 17,500
Preferred Stock, Shares Issued				18,228
Standby Purchase Agreement with Elliott [Member]
Class of Stock [Line Items]
Number of shares sold (in shares)			28,892,951					33,745,308
Percentage of ownership after rights offering	90.40%
Fair Value, Inputs, Level 3 [Member]
Class of Stock [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)							$ 31,606			$ 37,663