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Share Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings Per Share (Details) - $ / shares		3 Months Ended								12 Months Ended
		Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic average common shares outstanding	[1]									16,464,286.000	17,000,599.000	18,762,451.000
Incremental shares due to:
Restricted stock units										21,522.000	21,668.000	33,128.000
Performance shares										45,252.000	76,525.000	24,717.000
Incremental Common Shares Attributable to Stock Options										24,866.000	7,648	0
Diluted average common shares outstanding										16,555,926	17,106,440	18,820,296
Basic net earnings per common share		$ 4.92	$ 0.05	$ 0.49	$ 0.46	$ 0.56	$ 0.05	$ 1.22	$ 1.05	$ 5.91	$ 2.91	$ 2.98
Diluted net earnings per common share		$ 4.88	$ 0.05	$ 0.48	$ 0.45	$ 0.56	$ 0.05	$ 1.21	$ 1.05	$ 5.88	$ 2.90	$ 2.97
Anti-dilutive shares excluded from calculation										499,348.000	220,037.000	331,168.000
[1] Basic average common shares outstanding include restricted stock awards that are fully vested, but are deferred for future issuance. See Note 15, "Equity-Based Compensation Plans" for further discussion.

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