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Consolidated Statement of Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Common Class A [Member]
Common Stock [Member]
Common Class B [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2014 $ 168 $ 24 $ 141,248 $ (13,101) $ 40,865 $ 169,204
Net income           42,085 42,085
Other comprehensive loss (4,443) (4,443)
Purchase of treasury stock (4,994) (4,994)
Stock-based employee compensation expense 1   1,295       1,296
Exercise of stock options 1 1,091 1,092
Issuance of restricted shares, net     (3,666) 1,586     (2,080)
Balance at Dec. 31, 2015 170 24 139,968 (3,408) (17,544) 82,950 202,160
Net income 16,835 16,835
Other comprehensive loss         14,904   14,904
Stock-based employee compensation expense 1,178 1,178
Exercise of stock options (27) 59 32
Issuance of restricted shares, net (3,207) 2,265 (942)
Effect of adoption of ASU 2016-09 2,247 2,247
Balance at Dec. 31, 2016 170 24 137,912 (1,084) (2,640) 102,032 236,414
Net income 55,439 55,439
Other comprehensive loss 2,933 2,933
Stock-based employee compensation expense 951 951
Issuance of restricted shares, net 1 (1,621) 1,084 (536)
Balance at Dec. 31, 2017 $ 171 $ 24 $ 137,242 $ 293 $ 157,471 $ 295,201