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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($)
$ in Thousands
Common Stock [Member]
Common Class A [Member]
Common Stock [Member]
Common Class B [Member]
Additional Paid-in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2017 $ 171 $ 24 $ 137,242 $ 293 $ 157,471 $ 295,201
Net income 26,002 26,002
Other comprehensive income       1,194   1,194
Stock-based employee compensation expense     2,868     2,868
Issuance of restricted shares     294     294
Balance at Sep. 30, 2018 $ 171 $ 24 $ 140,404 $ 1,487 184,064 326,150
Effect of adoption of ASU 2014-09         $ 591 $ 591