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Comprehensive Income Changes in Accumulated Other Comprehensive Income By Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive loss before reclassifications	$ (338)	$ 0	$ 0
Amounts reclassified from accumulated other comprehensive loss	(80)	8	7
Other Comprehensive Loss	(4,965)	(35)	1,138
Accumulated Net Unrealized Investment Gain (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,250)	(382)	629
Other comprehensive loss before reclassifications	(2,116)	(940)	(1,024)
Amounts reclassified from accumulated other comprehensive loss	(331)	337	13
Other Comprehensive Loss	(2,116)	(603)	(1,011)
Reclassification due to the adoption of ASU No. 2018-02		(265)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(3,697)	(1,250)	(382)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(6,380)	(5,737)	(7,893)
Other comprehensive loss before reclassifications	(2,833)	214	1,721
Amounts reclassified from accumulated other comprehensive loss	242	362	435
Other Comprehensive Loss	(2,591)	576	2,156
Reclassification due to the adoption of ASU No. 2018-02		(1,219)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(8,971)	(6,380)	(5,737)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(884)	(715)	(708)
Other comprehensive loss before reclassifications	(338)	0	0
Amounts reclassified from accumulated other comprehensive loss	80	(8)	(7)
Other Comprehensive Loss	(258)	(8)	(7)
Reclassification due to the adoption of ASU No. 2018-02		(161)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,142)	(884)	(715)
AOCI Including Portion Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(8,514)	(6,834)	(7,972)
Other comprehensive loss before reclassifications	(5,287)	(726)	697
Amounts reclassified from accumulated other comprehensive loss	322	691	441
Other Comprehensive Loss	(4,965)	(35)	1,138
Reclassification due to the adoption of ASU No. 2018-02		(1,645)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (13,810)	$ (8,514)	$ (6,834)

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