Aggregate dividends paid during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_PaymentsOfDividendsCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.

+ References

+ Details

Name:	us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Aggregate dividends paid during the period for each share of preferred stock outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_PreferredStockDividendsPerShareCashPaid
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate dividends declared during the period for each share of preferred stock outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_PreferredStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesAPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesBPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events - Additional Information (Details) - USD ($)																3 Months Ended		6 Months Ended
	Jul. 27, 2016	Jun. 29, 2016	Jun. 27, 2016	Jun. 15, 2016	May 27, 2016	May 16, 2016	Apr. 27, 2016	Apr. 15, 2016	Mar. 28, 2016	Mar. 15, 2016	Feb. 27, 2016	Feb. 26, 2016	Feb. 15, 2016	Jan. 27, 2016	Jan. 15, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Subsequent Event [Line Items]
Common stock dividends cash paid (in dollars per share)		$ 0.22			$ 0.22		$ 0.27		$ 0.33		$ 0.33			$ 0.33
Aggregate amount paid to holders of record (in dollars)		$ 8,087,000			$ 8,087,000		$ 9,925,000		$ 12,131,000		$ 12,131,000			$ 12,131,000				$ 62,492,000	$ 84,753,000
Common stock dividends declared per common share (in dollars per share)				$ 0.22		$ 0.22		$ 0.27		$ 0.33			$ 0.33		$ 0.33	$ 0.71	$ 0.96	$ 1.70	$ 1.92
Series A Preferred Stock
Subsequent Event [Line Items]
Preferred stock dividends cash paid (in dollars per share)			$ 0.17		$ 0.17		$ 0.17		$ 0.17			$ 0.17		$ 0.17
Aggregate amount paid to holders of record (in dollars)			$ 374,800		$ 374,800		$ 374,800		$ 374,800			$ 374,800		$ 374,800				$ 2,248,800	$ 2,249,000
Series B Preferred Stock
Subsequent Event [Line Items]
Preferred stock dividends cash paid (in dollars per share)			$ 0.16		$ 0.16		$ 0.16		$ 0.16			$ 0.16		$ 0.16
Aggregate amount paid to holders of record (in dollars)			$ 927,000		$ 927,000		$ 927,000		$ 927,000			$ 927,000		$ 927,000				$ 5,562,000	$ 5,562,000
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends cash paid (in dollars per share)	$ 0.22
Aggregate amount paid to holders of record (in dollars)	$ 8,087,000
Common stock dividends declared per common share (in dollars per share)	$ 0.22
Subsequent Event \| Series A Preferred Stock
Subsequent Event [Line Items]
Preferred stock dividends cash paid (in dollars per share)	$ 0.17
Aggregate amount paid to holders of record (in dollars)	$ 375,000
Rate per preferred share dividends declared (in dollars per share)	$ 0.17
Subsequent Event \| Series B Preferred Stock
Subsequent Event [Line Items]
Preferred stock dividends cash paid (in dollars per share)	$ 0.16
Aggregate amount paid to holders of record (in dollars)	$ 927,000
Rate per preferred share dividends declared (in dollars per share)	$ 0.16