Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the par value method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Name:	us-gaap_TreasuryStockValueAcquiredParValueMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Stockholders' Equity (Narrative) (Details) - USD ($)	3 Months Ended					9 Months Ended
Stockholders' Equity (Narrative) (Details) - USD ($)	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Feb. 14, 2018
Class of Stock [Line Items]
Common stock repurchased	$ 25,000	$ 85,000	$ 1,300,000	$ 284,000	$ 55,000
2018 Stock Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount								$ 25,000,000
Class A Common Stock \| 2018 Stock Repurchase Program
Class of Stock [Line Items]
Common stock repurchased (in shares)	525			8,699		39,049	10,367
Common stock repurchased	$ 100,000			$ 200,000		$ 1,400,000	$ 300,000