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Employee Benefits and Share-Based Compensation - Performance-based Restricted Stock Units Activity (Details) - Performance Shares - USD ($) $ / shares in Units, $ in Millions					1 Months Ended	12 Months Ended
	Mar. 07, 2017	Feb. 08, 2017	Mar. 07, 2016	Feb. 04, 2016	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Weighted-Average Grant Date Fair Value
Trading days		20 days		20 days	20 days
2009 Plan
Number of Shares
Nonvested, beginning balance (in shares)						184,000
Granted (Awarded) (in shares)						148,000
Vested (Released) (in shares)						(107,000)
Nonvested, ending balance (in shares)						225,000	184,000
Weighted-Average Grant Date Fair Value
Nonvested, beginning balance (in dollars per share)						$ 24.89
Granted (Awarded) (in dollars per share)						34.05	$ 24.66	$ 29.56
Vested (Released) (in dollars per share)						24.36
Nonvested, ending balance (in dollars per share)						$ 31.18	$ 24.89
Weighted average period of compensation cost recognized (in years)						1 year 2 months 23 days
Unrecognized compensation cost						$ 2.7	$ 1.6
Vested in period, fair value						$ 2.6	$ 2.0	$ 1.9
2015 Performance Based Restricted Stock Units
Number of Shares
Awards eligible for vesting (in shares)			60,000
Awards vested by period end (in shares)						45,000
Weighted-Average Grant Date Fair Value
Percentile rank of stockholder return			66.00%
Percentage of shares eligible for time-based vesting			100.00%
Percentage of award vesting			25.00%
Vesting period (in years)						3 years
2016 Performance Based Restricted Stock Units
Number of Shares
Awards eligible for vesting (in shares)	122,740
Awards vested by period end (in shares)						61,375
Weighted-Average Grant Date Fair Value
Percentile rank of stockholder return	71.50%
Percentage of shares eligible for time-based vesting	100.00%
Percentage of award vesting	25.00%
Vesting period (in years)						36 months
Officer
Number of Shares
Granted (Awarded) (in shares)						147,830	122,740

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-Publisher FASB
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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