Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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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 weighted average fair value at grant date for nonvested equity-based awards issued 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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Equity - Restricted Stock (Details) - USD ($)	3 Months Ended
Equity - Restricted Stock (Details) - USD ($)	Mar. 31, 2018	Mar. 31, 2017
Restricted stock
Restricted stock awards
Compensation expense related to share-based award	$ 1,376,000	$ 1,257,000
Performance-based stock units
Restricted stock awards
Number of shares granted	0
Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted	147,990	132,641
Nonvested awards
Remaining compensation expense	$ 10,832,000
2018 \| Restricted stock
Nonvested awards
Remaining compensation expense	4,284,000
2019 \| Restricted stock
Nonvested awards
Remaining compensation expense	4,100,000
2020 \| Restricted stock
Nonvested awards
Remaining compensation expense	2,210,000
2021 \| Restricted stock and performance-based stock units
Nonvested awards
Remaining compensation expense	$ 238,000
Grant Date Price $38.18 \| Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted	147,990
Grant Date Price $38.18 \| Three year vesting \| Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted	81,819
Granted (in dollars per share)	$ 38.18
Vesting period	3 years
Grant Date Price $38.18 \| TSR Targets \| Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted	66,171
Granted (in dollars per share)	$ 38.18
Vesting period	4 years
Grant Date Price $38.18 \| Accelerated TSR Targets \| Restricted stock and performance-based stock units
Restricted stock awards
Vesting period	3 years
Grant Date Price $45.76 \| Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted		132,641
Grant Date Price $45.76 \| Three year vesting \| Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted		74,760
Granted (in dollars per share)		$ 45.76
Vesting period		3 years
Grant Date Price $45.76 \| TSR Targets \| Restricted stock and performance-based stock units
Restricted stock awards
Number of shares granted		57,881
Granted (in dollars per share)		$ 45.76
Vesting period		4 years
Grant Date Price $45.76 \| Accelerated TSR Targets \| Restricted stock and performance-based stock units
Restricted stock awards
Vesting period		3 years