Stockholders' Equity - Preferred Stock (Details) - shares	6 Months Ended	12 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Shares
Beginning balance (in shares)	0	14,369,965	14,369,965
Shares converted (in shares)	0	(14,369,965)
Ending balance (in shares)	0	0	0	14,369,965
Weighted Avg. Dividend Rate
Balance	0.00%	0.00%	0.00%	6.50%
Shares converted	0.00%	6.50%

Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_PreferredStockSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant