Equity - Restricted Stock (Details) - Restricted stock and performance-based stock units - USD ($)	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Restricted stock awards
Number of shares granted	156,718	140,057
Compensation expense related to share-based award	$ 2,897,000	$ 2,682,000
Nonvested awards
Remaining compensation expense	9,671,000
2018
Nonvested awards
Remaining compensation expense	2,973,000
2019
Nonvested awards
Remaining compensation expense	4,250,000
2020
Nonvested awards
Remaining compensation expense	2,210,000
2021
Nonvested awards
Remaining compensation expense	$ 238,000
Grant Date Price $38.18 \| Three year vesting
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 awards
Number of shares granted	66,171
Granted (in dollars per share)	$ 38.18
Grant Date Price $41.25 \| Vesting Date, 30 May, 2019
Restricted stock awards
Number of shares granted	8,728
Granted (in dollars per share)	$ 41.25
Grant Date Price $45.76 \| Three year vesting
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 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 awards
Vesting period		3 years
Grant Date Price $48.55 \| Vesting Date, June 1, 2018
Restricted stock awards
Number of shares granted		7,416
Granted (in dollars per share)		$ 48.55

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
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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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
-Publisher FASB
-Name Accounting Standards Codification
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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.

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