Stockholders' Equity (Narrative) (Details) - USD ($)	3 Months Ended
Mar. 31, 2019	Feb. 14, 2018
Class of Stock [Line Items]
Common stock repurchased	$ 1,300,000
2018 Stock Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount		$ 25,000,000
Shares Outstanding Class A \| 2018 Stock Repurchase Program
Class of Stock [Line Items]
Common stock repurchased (in shares)	36,294
Common stock repurchased	$ 1,300,000

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

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