4. Debt Unsecured Term Loan (Details) (USD $) | 9 Months Ended | |
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 |
Debt Instrument [Line Items] | ' | ' | ' |
Unsecured Term Loan | $250,000,000 | ' | $154,000,000 |
Write off of Deferred Debt Issuance Cost | 1,701,000 | 32,310,000 | ' |
After First Amendment [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Maturity Date | 21-Jul-19 | ' | ' |
Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Issuance Date | 13-Sep-13 | ' | ' |
Unsecured Term Loan | 195,000,000 | ' | 154,000,000 |
Debt Instrument, Maturity Date | 15-Feb-19 | ' | ' |
Unsecured Term Loan Accordion Increase Amount | 55,000,000 | ' | ' |
Accordion Exercise Date | 18-Oct-13 | ' | ' |
Unsecured Term Loan with Accordion | 250,000,000 | ' | ' |
Unsecured Term Loan Remaining Balance Drawn | 96,000,000 | ' | ' |
Delayed Draw Deadline | 10-Jan-14 | ' | ' |
Write off of Deferred Debt Issuance Cost | 1,400,000 | ' | ' |
Write Off Of Unamortized Debt Issuance Cost | 700,000 | ' | ' |
Maximum [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Unsecured Debt To Unencumbered Assets | 60.00% | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 60.00% | ' | ' |
Minimum [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Income from Unencumbered Assets To Unsecured Debt | 12.50% | ' | ' |
Fixed Charge Coverage Ratio | 1.7 | ' | ' |
Tangible Net Worth Amount | $1,300,000,000 | ' | ' |
Percentage Of Equity Offerings And Interests In Operating Partnerships To Be Added To Tangible Net Worth Threshold | 80.00% | ' | ' |
Credit Rating Level 1 [Member] | Greater than A- S&P, Moody's A3 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.95% | ' | ' |
Credit Rating Level 1 [Member] | Greater than A- S&P, Moody's A3 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.83% | ' | ' |
Credit Rating Level 1 [Member] | Greater than A- S&P, Moody's A3 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.00% | ' | ' |
Credit Rating Level 1 [Member] | Greater than A- S&P, Moody's A3 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.00% | ' | ' |
Credit Rating Level 2 [Member] | Greater than BBB plus S&P, Moody's Baa1 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.05% | ' | ' |
Credit Rating Level 2 [Member] | Greater than BBB plus S&P, Moody's Baa1 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.88% | ' | ' |
Credit Rating Level 2 [Member] | Greater than BBB plus S&P, Moody's Baa1 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.05% | ' | ' |
Credit Rating Level 2 [Member] | Greater than BBB plus S&P, Moody's Baa1 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.00% | ' | ' |
Credit Rating Level 3 [Member] | Greater than BBB S&P, Moody's Baa2 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.20% | ' | ' |
Credit Rating Level 3 [Member] | Greater than BBB S&P, Moody's Baa2 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.00% | ' | ' |
Credit Rating Level 3 [Member] | Greater than BBB S&P, Moody's Baa2 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.20% | ' | ' |
Credit Rating Level 3 [Member] | Greater than BBB S&P, Moody's Baa2 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.00% | ' | ' |
Credit Rating Level 4 [Member] | Greater than BBB- S&P, Moody's Baa3 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.50% | ' | ' |
Credit Rating Level 4 [Member] | Greater than BBB- S&P, Moody's Baa3 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.25% | ' | ' |
Credit Rating Level 4 [Member] | Greater than BBB- S&P, Moody's Baa3 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.50% | ' | ' |
Credit Rating Level 4 [Member] | Greater than BBB- S&P, Moody's Baa3 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.25% | ' | ' |
Credit Rating Level 5 [Member] | Less than BBB- S&P, Moody's Baa3 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.95% | ' | ' |
Credit Rating Level 5 [Member] | Less than BBB- S&P, Moody's Baa3 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.65% | ' | ' |
Credit Rating Level 5 [Member] | Less than BBB- S&P, Moody's Baa3 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.95% | ' | ' |
Credit Rating Level 5 [Member] | Less than BBB- S&P, Moody's Baa3 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.65% | ' | ' |
Pricing Level 1 [Member] | Maximum [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 35.00% | ' | ' |
Pricing Level 1 [Member] | Maximum [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 35.00% | ' | ' |
Pricing Level 1 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.75% | ' | ' |
Pricing Level 1 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.50% | ' | ' |
Pricing Level 1 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.75% | ' | ' |
Pricing Level 1 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.50% | ' | ' |
Pricing Level 2 [Member] | Maximum [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 40.00% | ' | ' |
Pricing Level 2 [Member] | Maximum [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 40.00% | ' | ' |
Pricing Level 2 [Member] | Minimum [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 35.00% | ' | ' |
Pricing Level 2 [Member] | Minimum [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 35.00% | ' | ' |
Pricing Level 2 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.90% | ' | ' |
Pricing Level 2 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.60% | ' | ' |
Pricing Level 2 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.90% | ' | ' |
Pricing Level 2 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.60% | ' | ' |
Pricing Level 3 [Member] | Maximum [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 45.00% | ' | ' |
Pricing Level 3 [Member] | Maximum [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 45.00% | ' | ' |
Pricing Level 3 [Member] | Minimum [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 40.00% | ' | ' |
Pricing Level 3 [Member] | Minimum [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 40.00% | ' | ' |
Pricing Level 3 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 2.05% | ' | ' |
Pricing Level 3 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.75% | ' | ' |
Pricing Level 3 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.05% | ' | ' |
Pricing Level 3 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.75% | ' | ' |
Pricing Level 4 [Member] | Maximum [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 52.50% | ' | ' |
Pricing Level 4 [Member] | Maximum [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 52.50% | ' | ' |
Pricing Level 4 [Member] | Minimum [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 45.00% | ' | ' |
Pricing Level 4 [Member] | Minimum [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 45.00% | ' | ' |
Pricing Level 4 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 2.20% | ' | ' |
Pricing Level 4 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.90% | ' | ' |
Pricing Level 4 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.20% | ' | ' |
Pricing Level 4 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 0.90% | ' | ' |
Pricing Level 5 [Member] | Minimum [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 52.50% | ' | ' |
Pricing Level 5 [Member] | Minimum [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Ratio of Total Indebtedness To Gross Assets Value | 52.50% | ' | ' |
Pricing Level 5 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 2.40% | ' | ' |
Pricing Level 5 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 2.10% | ' | ' |
Pricing Level 5 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.40% | ' | ' |
Pricing Level 5 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member] | After First Amendment [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | 1.10% | ' | ' |