Registration Statement on Form S-3 (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Registration Statement on Form S-3 [Line Items]
Registration Payment, Arrangement for Common Stock	$ 30

This element represents the potential proceeds from the sale of common stock under the shelf registration statement during the period.

No definition available.

Name:	pdo_RegistrationPaymentArrangementForCommonStock
Namespace Prefix:	pdo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration