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Income Taxes - Reconciliation of Cash Dividends Paid (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of cash dividends paid to dividends paid deduction [Abstract]      
Cash dividends paid common stock $ 76,735us-gaap_DividendsCash $ 45,189us-gaap_DividendsCash $ 26,306us-gaap_DividendsCash
Less: Dividends on deferred compensation plan shares 0us-gaap_DividendsShareBasedCompensationCash 0us-gaap_DividendsShareBasedCompensationCash (3)us-gaap_DividendsShareBasedCompensationCash
Less: Dividends absorbed by current earnings and profits (76,735)pky_DividendsAbsorbedByCurrentEarningsAndProfits (36,291)pky_DividendsAbsorbedByCurrentEarningsAndProfits 0pky_DividendsAbsorbedByCurrentEarningsAndProfits
Less: Return of capital 0us-gaap_PaymentsOfCapitalDistribution (8,898)us-gaap_PaymentsOfCapitalDistribution (26,303)us-gaap_PaymentsOfCapitalDistribution
Dividends paid deduction $ 0pky_DividendsPaidDeduction $ 0pky_DividendsPaidDeduction $ 0pky_DividendsPaidDeduction